The Firing Line Forums Does Short-Slide, Big Grip = More Efficient Shooting?
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 View Poll Results: Is a Shorter Slide/Longer Grip faster shooting than a Longer Slide/Shorter Grip pistol? Yes 3 23.08% No 7 53.85% Maybe 2 15.38% Depends on the pistol (independent of shooter) 1 7.69% Voters: 13. You may not vote on this poll

 January 24, 2019, 09:26 PM #2 chris in va Senior Member   Join Date: December 26, 2004 Location: Louisville KY Posts: 13,624 Heck of a first post.
 January 24, 2019, 10:29 PM #3 74A95 Senior Member   Join Date: November 26, 2016 Posts: 559 Some of your premises might be wrong. The longer the barrel, the lower the gas pressure at the muzzle when the bullet exits. Data from QuickLOAD, 9mm Luger, 124 grain bullet, 8.0 grains of Accurate #7 powder. 5” barrel velocity = 1220 gas pressure at muzzle = 4548 psi % powder burned = 75.22% 4” barrel velocity = 1157 fps gas pressure at muzzle = 5808 psi % powder burned = 72.44% The difference in burned powder is just 3% The difference in gas pressure is 28% In general, gas pressure contributes to the recoil force via Newton’s law of every action causes an equal reaction. The higher gas pressure in the 4” barrel should contribute a larger percent to recoil force than the lower gas pressure from the 5” barrel. While people talk a lot about the amount of unburned powder being a factor in recoil, in reality it might not matter. What does matter, I suspect, is the gas pressure at the muzzle, regardless of whether the powder is all burned or not.
 January 24, 2019, 10:50 PM #4 spitfiremac Junior Member   Join Date: September 29, 2017 Posts: 3 Great reply 74A95... now we're cooking. Shorter barrel = higher gas pressure = greater recoil force DONE So a shorter barrel would contribute to recoil forces to a variable extent. The question is whether or not that would be enough to mitigate the advantage that the lighter mass of a smaller slide could bring? Even if it would, there's still the possibility of a longer barrel emerging from a smaller slide like a 5" or 6" from a Glock 19 or 26. Assuming you had the right ammo to cycle with those forces at play and maybe a red dot you'd still be good then, maybe flatter shooting. It'd look stupid, but most gun trends do before they pick up. I'm using 9mm Glocks for as a reference since they're basically the currency of the community now a days.
 January 25, 2019, 12:05 AM #5 Cheapshooter Senior Member   Join Date: December 2, 2007 Location: Missouri Posts: 7,689 Voted maybe because if it does I doubt it is significant enough to notice __________________ Cheapshooter's rules of gun ownership #1: NEVER SELL OR TRADE ANYTHING!
 January 25, 2019, 12:59 AM #6 imp Senior Member   Join Date: November 11, 2006 Location: Pistol-Vania Posts: 558 My thoughts on the subject have nothing to do with slide weight or recoil, just that there is a benefit to a shorter sight radius. The longer sight radius may lend itself to more accurate shooting, but a shorter one is faster to acquire. The difference between a 4 inch barrel and a 5 inch one may not be super easy to identify, but I've noticed a big difference when transitioning from a snub nosed revolver to a long barreled one. The front sight seems to swim around for a fraction of a second longer, resulting in slower split times.
 January 25, 2019, 01:09 AM #7 JohnKSa Staff   Join Date: February 12, 2001 Location: DFW Area Posts: 22,104 The weight difference between a G17 and a G19 (no ammo or magazine) is 0.89 ounces. Even if we assume that almost all of that weight difference is in the recoiling mass, it's still not a big change. If you can find someone who owns a G19 with a threaded barrel, find a muzzle attachment that weighs about an ounce and then see if the gun shoots differently with and without the attachment. Or maybe shoot a G19 side by side with a G19 that has a slide-mounted micro red dot. __________________ Do you know about the TEXAS State Rifle Association?
January 25, 2019, 01:28 AM   #8
74A95
Senior Member

Join Date: November 26, 2016
Posts: 559
Quote:
 Originally Posted by JohnKSa If you can find someone who owns a G19 with a threaded barrel, find a muzzle attachment that weighs about an ounce and then see if the gun shoots differently with and without the attachment.
The longer threaded barrel might itself weigh an ounce more than the regular barrel.

January 25, 2019, 02:34 AM   #9
44 AMP
Staff

Join Date: March 11, 2006
Location: Upper US
Posts: 19,237
Quote:
 Long slide = long barrel = faster bullet & gases = more recoil
I'm not so sure about all of that...

Long slide = long barrel, sure

= faster bullet, sure

= more recoil, not so sure.

Consider, same ammo, so same amount of energy available. Long slide & barrel = more mass. More mass will be different from less mass (short slide) once it gets moving but it also takes "longer" to get moving and moves slower.

And that can have an effect on FELT recoil.

Longer barrel usually means LESS recoil due to more weight. leave the slide completely out of it and shoot a revolver or single shot with the same ammo and a short vs long barrel. The longer barrel heavier gun recoils LESS.

Or stick with the autopistol. Shoot a Government model (5") and then shoot the same thing in an Officer's Model (3.5"). If you think the Govt model recoils more, I think you're crazy.

Yes, the math shows long barrels shoot faster, and faster means more energy and that energy means more recoil, BUT you aren't allowing for the weight of the longer barrel reducing the recoil effect despite the increased velocity. The mass of the longer barrel (and slide) literally "outweighs" the slight increase in recoil energy gained with the higher velocity obtained through the longer barrel.

The other point, about sight distance, longer does allow for more precision and that does take more time, but long or short sight radius can be used with the "flash sight picture" and I think any real difference in speed will be due to the individual shooter more than anything else.
__________________
All else being equal (and it almost never is) bigger bullets tend to work better.

 January 25, 2019, 07:40 AM #10 tallball Senior Member   Join Date: October 17, 2014 Posts: 2,333 To me, for revolvers and semi-autos in general, longer barrels seem to have less felt recoil. It might have more to do with overall weight than anything else.
 January 25, 2019, 08:17 AM #11 dahermit Senior Member   Join Date: October 28, 2006 Location: South Central Michigan...near Posts: 5,468 More efficient shooting? Longer slide = Longer barrel = longer sight radius = more accurate shooting?
 January 25, 2019, 09:46 AM #12 RickB Senior Member   Join Date: March 1, 2000 Location: Western WA Posts: 7,742 I don't think there's one answer. I've competed extensively with both a 3.5" .45 and a 6" .45, and my scores were dramatically better with the latter, but I was able to run lighter loads in the longslide, it also has better sights, etc., etc.; it would be difficult for most people to isolate only the length/weight/balance effects. __________________ Runs off at the mouth about anything 1911 related on this site and half the time is flat out wrong.
 January 25, 2019, 11:39 AM #13 spitfiremac Junior Member   Join Date: September 29, 2017 Posts: 3 Thank you all for your insight and experience. It seems like the consensus is there might, repeat MIGHT, be validity to the idea that a lessened reciprocating mass would lead to marginally lessened force and recoil. There also is clear consensus that whatever advantage this might provide is mitigated by the advantages of reduced recoil from the longer, heavier barrel providing consistent leverage forward and down. It also seems that in general, we all agree that a longer sight radius is both more precise and ever so slightly slower to line up... both of which is close to a marginal shift. Given this, there's no surprise that the competition market went where it went, with long slides, barrels, sights, and lightening cuts throughout.
 January 25, 2019, 01:22 PM #14 74A95 Senior Member   Join Date: November 26, 2016 Posts: 559 Keep in mind that one of the reasons for slide weight reduction is to allow the recoil to reliably cycle the gun. A 9mm does not have that much recoil, and with a locked breech pistol, if the slide/barrel weighs too much, it won't cycle. That could contribute to why some of the long slide Glocks have the cutouts. This is a big issue with building open class guns in 9mm and 38 Super. Adding the compensator significantly reduces recoil because of the extra barrel weight (longer barrel) and compensator. One purpose of the compensator is to reduce slide velocity, which it does very well, because the gases push forward on the comp baffles and this slows their rearward movement. Many times, the gun won't cycle with standard ammo, and only Major power factor ammo will reliably cycle the gun. This is also why many open class guns have their slide lightened. The slide, barrel and compensator combination is just to damn heavy to reliably cycle even with powerful ammo. Open shooters also have to reduce the weight of their recoil and hammer springs for the same reason - they produce less resistance to slide movement. But if they reduce the recoil spring to much, the slide won't strip a round from the magazine. I built my own Open gun and you have to get al this stuff right to get the gun to run. https://americanhandgunner.com/featu...ey-really-work Lone Wolf 9mm compensators often come with a warning that some of their comps might not run reliably with standard ammo. It's because of the added weight and the effectiveness of the comp's design. https://www.lonewolfdist.com/Detail.aspx?PROD=922040
 January 26, 2019, 01:16 AM #15 44 AMP Staff   Join Date: March 11, 2006 Location: Upper US Posts: 19,237 Semi auto firearms are balancing acts. Slide/bolt mass, mass of other moving parts, spring tension, and other things are all calculated to use the available energy from recoil or gas pressure to operate the mechanism "hard" enough to function reliably, but not so hard it beats itself to death. Change any of these factors and the entire balance is changed. The pistols are designed and built to operate within a fairly narrow range of conditions when it comes to load levels. Inside its "envelope" they run pretty reliably. Out side that, not so much. there are some parallels with motor vehicles, a duty pistol might be likened to a military truck made to run on multiple fuels acceptably well, and a match gun to a top fuel dragster, a specialized machine made to run on specialized fuel, only. And like the engines in those examples, if you feed it something its not tuned for, it won't run right, and might even be dangerous. Knew a case where a guy got killed because he put jet fuel in his deuce and a half, saw my company commander limp his Duster back to main post running it on rifle bore cleaner too. (he planned poorly and ran out of gas and the bore cleaner was the only "fuel" available..car never did run right, after that, though ) If you put bio-diesel in your race car instead of what it was built to use, its unlikely you'll win the race... __________________ All else being equal (and it almost never is) bigger bullets tend to work better.
 January 26, 2019, 09:00 AM #16 CDW4ME Senior Member   Join Date: March 18, 2009 Posts: 1,049 shot timer + guns to compare + same ammo = answer (at least for that individual) __________________ I'm not inclined to disarm for a concert, game, (entertainment) and I ain't going on a plane or cruise. "Wouldn't want to / Nobody volunteer to" get shot by _____ is not indicative of quickly incapacitating.
 January 26, 2019, 09:02 AM #17 pete2 Senior Member   Join Date: May 15, 2012 Location: Texas Posts: 1,872 The answer, for me, is that a Steel Commander pistol is faster out of the holster than a 5" 1911. First shot is faster but it may or may not be as accurate for me. follow up shots may be slightly more accurate with the 5" gun. My opinion is that being a split second faster with that first shot makes the Commander a little better for carry. A lightweight Commander is my choice to carry for a 1911 gun. A Lightweight Commander length with the Officer's handle would be better for carry because it is easier to conceal but I like the full size handle. My 2 cents for what it's worth.....................
 January 26, 2019, 01:37 PM #18 tipoc Senior Member   Join Date: December 11, 2004 Location: Redwood City, Ca. Posts: 3,713 In reading through the original post I was a bit confused by the questions. See the G19X is a gun with the slide of the G19 and the frame of the G17. The compact slide on the larger duty frame. The advantage is a few more rounds. Oh and the lanyard loop. The trade off being it's a bit harder to conceal and it weighs more than the G19. The G17 slide (7.32") is a standard length slide while the G19 is compact (6.85"). A .470" difference. The G19X, with a full magazine, weighs 31.39 oz.s vs. 30.16 for the G19. The additional weight on the G19X will dampen recoil a bit but most shooters won't feel much difference in actual shooting. Well, except for those who prefer the longer grip frame. In fact it's likely that the weight of the bullet, it's velocity, bullet construction and maker will cause more actual felt differences than much do to the increased weight of the frame. None of the guns mentioned above are intentionally geared toward competition by the maker. You will begin to see actual differences when using the G34 or the G17L both are geared towards competition. The sight radius is longer and the slides lightened. tipoc __________________ 1. All guns are always loaded. 2. Never let the muzzle cover anything you are not willing to destroy. 3. Keep your finger off the trigger till you are ready to shoot. 4. Identify your target and know what is beyond it.
 January 27, 2019, 04:45 PM #19 Pops1085 Senior Member   Join Date: November 25, 2012 Posts: 349 I wonder if it wouldn’t be more helpful when thinking about this to think in extremes and then drawing conclusions based on emperical evidence? For example, I feel like this could be more understood if we thought about the difference between a 6-7” long slide 1911 in 45acp vs a 3” 1911 with a government sized frame like the Para Expert Carry? I feel like we could make some good conclusions if we looked at that and then scaled it down to smaller differences like 5” vs 4” Glocks. Just thinking out loud here. I have none of the aforementioned firearms but somebody must.
 January 27, 2019, 05:21 PM #20 Sharkbite Senior Member   Join Date: November 4, 2013 Location: Western slope of Colorado Posts: 3,126 Part of the recoil force is caused by the jet effect of the gasses blowing out the muzzle. They push towards the tgt and shove the gun back at the shooter. That is how compensators work. By redirecting those gasses up and shoving the muzzle down. I would think a shorter slide/barrel would make that worse
 January 29, 2019, 01:56 PM #21 K_Mac Senior Member   Join Date: September 15, 2010 Posts: 1,821 For me the physics are not really the issue. The shorter slide on a longer grip changes the balance and feel of the pistol. These are subjective differences that are going to vary from one person to the next. Which one works better for you? I like the feel of a shorter slide to grip ratio, but I shoot a standard compact pistol better. Repetition is probably the real difference. __________________ "Any fool can criticize, condemn and complain and most fools do." Benjamin Franklin

 Tags compact , physics , recoil , recoil math , slide action

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