Lowers and uppers

Drummer101 · January 24, 2010, 09:23 PM

How much impact does the lower assembly of a AR have on accuracy, I would think that the firing and action is contained in the upper. Any thoughts?

Creeper · January 24, 2010, 09:30 PM

Well, for starters, as the trigger group is in the lower and the bolt carrier in the upper... a decent fit between the two is kinda nice for the consistency of a repeatable firing pin/primer strike.

C

LukeA · January 24, 2010, 10:03 PM

The differences in performance between two quality lowers mounted to one upper are negligible.

Tucker 1371 · January 24, 2010, 10:05 PM

Quote:

quality lowers

Who makes a quality lower? I was considering buying a CMMG complete lower in a few months.

WhyteP38 · January 24, 2010, 10:12 PM

Stag, Mega, LMT, CMMG, DPMS are a few stripped lowers that are good. Hard to go wrong with most stripped lowers. It's the parts inside and the stock where the real quality differences begin to emerge.

You might check here first:
http://www.rainierarms.com/?page=sho...ceivers-lowers

Generally, the Stag LPK is considered better than the DPMS LPK. Not necessarily the best LPK, but better than DPMS.

RockyMtnTactical · January 25, 2010, 02:48 PM

Basically, very little effect.

DSA has lowers for $60.

10-96 · January 26, 2010, 02:51 AM

I agree. Mechanically, if you can reproduce each shot in the exact same way- it wouldn't matter if you had a major rattle-trap for a lower. Now, to get all your shots off the same- a tight fit between the upper and lower would be desirable. And to enhance that, a trigger group that allows a strike to the firing pin WITHOUT undue stress/movement/jerking of the trigger is another addition to what ever accuracy the upper and ammo can support.

While they were by no means benchrest or match quallity rifles- I've seen some M16A1's and a few A2's that were amazingly loose and sloppy BUT they still were able to deliver great groupings. This was because the lower (however loose) did it's job of holding the upper up so the shooter could allign the sights, actuate the trigger, and do it all again several times.

January 24, 2010, 09:23 PM	#1
Drummer101 Senior Member Join Date: October 22, 2009 Location: DFW Posts: 943	Lowers and uppers How much impact does the lower assembly of a AR have on accuracy, I would think that the firing and action is contained in the upper. Any thoughts?

January 24, 2010, 09:30 PM	#2
Creeper Senior Member Join Date: September 9, 2008 Location: Woooooshington Posts: 1,797	Well, for starters, as the trigger group is in the lower and the bolt carrier in the upper... a decent fit between the two is kinda nice for the consistency of a repeatable firing pin/primer strike. C __________________ Shoulder Drive Nicholson Club

January 24, 2010, 10:12 PM	#5
WhyteP38 Senior Member Join Date: September 22, 2005 Location: Behind a keyboard. Posts: 1,565	Stag, Mega, LMT, CMMG, DPMS are a few stripped lowers that are good. Hard to go wrong with most stripped lowers. It's the parts inside and the stock where the real quality differences begin to emerge. You might check here first: http://www.rainierarms.com/?page=sho...ceivers-lowers Generally, the Stag LPK is considered better than the DPMS LPK. Not necessarily the best LPK, but better than DPMS. Last edited by WhyteP38; January 24, 2010 at 10:23 PM.

January 25, 2010, 02:48 PM	#6
RockyMtnTactical Senior Member Join Date: October 21, 2006 Location: Western US Posts: 1,961	Basically, very little effect. DSA has lowers for $60. __________________ https://battlebornreview.com/

January 26, 2010, 02:51 AM	#7
10-96 Senior Member Join Date: October 19, 2005 Location: Tx Panhandle Territory Posts: 4,159	I agree. Mechanically, if you can reproduce each shot in the exact same way- it wouldn't matter if you had a major rattle-trap for a lower. Now, to get all your shots off the same- a tight fit between the upper and lower would be desirable. And to enhance that, a trigger group that allows a strike to the firing pin WITHOUT undue stress/movement/jerking of the trigger is another addition to what ever accuracy the upper and ammo can support. While they were by no means benchrest or match quallity rifles- I've seen some M16A1's and a few A2's that were amazingly loose and sloppy BUT they still were able to deliver great groupings. This was because the lower (however loose) did it's job of holding the upper up so the shooter could allign the sights, actuate the trigger, and do it all again several times. __________________ Rednecks... Keeping the woods critter-free since March 2, 1836. (TX Independence Day) I suspect a thing or two... because I've seen a thing or two.

January 24, 2010, 10:03 PM	#3
LukeA Senior Member Join Date: July 1, 2009 Posts: 542	The differences in performance between two quality lowers mounted to one upper are negligible.

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