450 Bushmaster buffer spring

Mattj4867 · December 11, 2018, 10:12 PM

Hi all, recently acquired a bear creek Arsenal 450 bushmaster upper with the 18” barrel. I think I am going to get a complete psa lower and was wondering if I need to change out the buffer spring on it because of the increase of recoil. I will be shooting mostly 250gr ammo through it. Also where can I find decent magazines for it. Any suggestions thanks!

Mobuck · December 12, 2018, 07:02 AM

AHHH, the "buffer spring" really has little effect on nor is affected by "recoil".
I don't have (nor do I expect to have)any of the big bore AR's but barring influences specific to those heavier recoiling calibers, buffer springs only provide/direct bolt movement.
The forces of recoil are already in motion by the time the bolt starts to move. As long as the buffer isn't hammering into the end of the buffer tube, the spring is doing all it can do.

10-96 · December 12, 2018, 07:15 AM

Just to add to what Mobuck said- Remember, there's no one-size-fits-all when it comes to the size of the gas port holes in different calibered barrels. Too little of a hole= Short strokes. Too much of a hole= mucho hammering. Try it first, and look at where your empties are landing. It may be fine, or you may have to look at an adjustable gas block, or a heavier buffer.

stagpanther · December 12, 2018, 07:24 AM

My 458 socom runs off of standard buffer components I believe. Off the top of my head I don't believe either the bushie or socom run at pressures much over 30K psi +/-. If reducing the kick is your goal your best bet is probably getting a good brake, or simply make the gun heavier. My gun is a pretty lightweight carbine for woods hunting--so it does thump a bit when I let loose a 325 gr dinosaur-dropper.

44caliberkid · December 12, 2018, 07:47 AM

Start with the standard buffer and spring and see how it goes. Until you have an up and runnng weapon, there is no way to tell if you have problems or not. Then you can diagnose fixes, if any are needed.

stagpanther · December 12, 2018, 07:52 AM

As has been said--doing business with Tromix is a sure-fire way to get set up right with these big bores.

sevt_chevelle · December 12, 2018, 05:41 PM

You could get an A5 buffer system, the extension tube is longer then a carbine tube. The A5 IMO smooths out the recoil making it feel like less recoil. I've swapped all my ARs to an A5 from BCM. I built a lower to match my existing Colt 6920 and swapped them around, the difference was night and day between the carbine tube lower and the A5 lower.

Lancer mags are very popular with 450 shooters, I can get 13 rounds in my 30 round mags.

sevt_chevelle · December 12, 2018, 05:44 PM

Double post

Rembrandt · December 12, 2018, 07:14 PM

450 magazines are hit and miss....I'm no fan of the Bushmaster brand, the cupped out portion of their followers are tapered and too narrow for a round to be cradled in it.

Best out there is the Lancer brand mags with Tromix followers.

stagpanther · December 12, 2018, 07:21 PM

Quote:

Best out there is the Lancer brand mags with Tromix followers.

That's what I run in my 458 socom--the combo functions flawlessly.

Mattj4867 · December 13, 2018, 12:38 AM

Thank you everyone for the info. Will put it to good use

Mattj4867 · December 13, 2018, 10:03 PM

Well, I ordered the lancer 10rd mag. I’ve read that some people are getting decent reliability without making the modification with the tromix. Anyone on here got any experience? The Tromix followers are very expensive too. $16 plus $12 shipping is ridiculous. While the thread is still going, I got another question. Do y’all think 45acp full metal jackets or hollow points will cycle well in an AR?

stagpanther · December 14, 2018, 02:19 AM

Quote:

Well, I ordered the lancer 10rd mag. I’ve read that some people are getting decent reliability without making the modification with the tromix. Anyone on here got any experience? The Tromix followers are very expensive too. $16 plus $12 shipping is ridiculous.

expensive is relative--I've run my magazines with a wide variety of loads and the lancer/tromix mag has never once failed to reliably cycle. As I recall I bought a 3-pack of followers so the cost was spread out a bit. The majority of magazine followers and springs are pretty mediocre in my experience--even some of the top-priced top-reputation ones can have tilt/feed issues. I'd gladly pay the extra money for a mag with better reliability.

Rembrandt · December 14, 2018, 07:56 AM

10 round Lancer with a Tromix follower will give you a 4 round capacity magazine. They are definitely worth it. I have also put Tromix followers in 30 round metal GI mags, work well but stick out too far for my liking.

9x19 · December 14, 2018, 08:07 AM

In my .450BM I use Brownell's 20 round mags with a replacement follower from these folks (mags hold 7 rounds):

http://www.chambertactical.com/produ...-follower-new/

December 11, 2018, 10:12 PM	#1
Mattj4867 Member Join Date: January 17, 2017 Posts: 85	450 Bushmaster buffer spring Hi all, recently acquired a bear creek Arsenal 450 bushmaster upper with the 18” barrel. I think I am going to get a complete psa lower and was wondering if I need to change out the buffer spring on it because of the increase of recoil. I will be shooting mostly 250gr ammo through it. Also where can I find decent magazines for it. Any suggestions thanks! Last edited by Mattj4867; December 11, 2018 at 10:22 PM.

December 12, 2018, 07:15 AM	#3
10-96 Senior Member Join Date: October 19, 2005 Location: Tx Panhandle Territory Posts: 4,159	Just to add to what Mobuck said- Remember, there's no one-size-fits-all when it comes to the size of the gas port holes in different calibered barrels. Too little of a hole= Short strokes. Too much of a hole= mucho hammering. Try it first, and look at where your empties are landing. It may be fine, or you may have to look at an adjustable gas block, or a heavier buffer. __________________ 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.

December 12, 2018, 07:24 AM	#4
stagpanther Senior Member Join Date: March 2, 2014 Posts: 11,770	My 458 socom runs off of standard buffer components I believe. Off the top of my head I don't believe either the bushie or socom run at pressures much over 30K psi +/-. If reducing the kick is your goal your best bet is probably getting a good brake, or simply make the gun heavier. My gun is a pretty lightweight carbine for woods hunting--so it does thump a bit when I let loose a 325 gr dinosaur-dropper. __________________ "Everyone speaks gun."--Robert O'Neill *I am NOT an expert--I do not have any formal experience or certification in firearms use or testing; use any information I post at your own risk!*

December 12, 2018, 07:52 AM	#6
stagpanther Senior Member Join Date: March 2, 2014 Posts: 11,770	As has been said--doing business with Tromix is a sure-fire way to get set up right with these big bores. __________________ "Everyone speaks gun."--Robert O'Neill *I am NOT an expert--I do not have any formal experience or certification in firearms use or testing; use any information I post at your own risk!*

December 14, 2018, 08:07 AM	#15
9x19 Senior Member Join Date: October 15, 1998 Location: Sherman, TX USA Posts: 3,750	In my .450BM I use Brownell's 20 round mags with a replacement follower from these folks (mags hold 7 rounds): http://www.chambertactical.com/produ...-follower-new/ __________________ Make mine lean, mean, and 9x19!

December 12, 2018, 07:02 AM	#2
Mobuck Junior member Join Date: February 2, 2010 Posts: 6,846	AHHH, the "buffer spring" really has little effect on nor is affected by "recoil". I don't have (nor do I expect to have)any of the big bore AR's but barring influences specific to those heavier recoiling calibers, buffer springs only provide/direct bolt movement. The forces of recoil are already in motion by the time the bolt starts to move. As long as the buffer isn't hammering into the end of the buffer tube, the spring is doing all it can do.

December 12, 2018, 07:47 AM	#5
44caliberkid Senior Member Join Date: May 15, 2017 Location: Iowa Posts: 1,098	Start with the standard buffer and spring and see how it goes. Until you have an up and runnng weapon, there is no way to tell if you have problems or not. Then you can diagnose fixes, if any are needed.

December 12, 2018, 05:41 PM	#7
sevt_chevelle Senior Member Join Date: April 13, 2013 Posts: 324	You could get an A5 buffer system, the extension tube is longer then a carbine tube. The A5 IMO smooths out the recoil making it feel like less recoil. I've swapped all my ARs to an A5 from BCM. I built a lower to match my existing Colt 6920 and swapped them around, the difference was night and day between the carbine tube lower and the A5 lower. Lancer mags are very popular with 450 shooters, I can get 13 rounds in my 30 round mags.

December 12, 2018, 05:44 PM	#8
sevt_chevelle Senior Member Join Date: April 13, 2013 Posts: 324	Double post

December 12, 2018, 07:14 PM	#9
Rembrandt Senior Member Join Date: August 10, 2002 Posts: 2,108	450 magazines are hit and miss....I'm no fan of the Bushmaster brand, the cupped out portion of their followers are tapered and too narrow for a round to be cradled in it. Best out there is the Lancer brand mags with Tromix followers.

December 13, 2018, 12:38 AM	#11
Mattj4867 Member Join Date: January 17, 2017 Posts: 85	Thank you everyone for the info. Will put it to good use

December 13, 2018, 10:03 PM	#12
Mattj4867 Member Join Date: January 17, 2017 Posts: 85	Well, I ordered the lancer 10rd mag. I’ve read that some people are getting decent reliability without making the modification with the tromix. Anyone on here got any experience? The Tromix followers are very expensive too. $16 plus $12 shipping is ridiculous. While the thread is still going, I got another question. Do y’all think 45acp full metal jackets or hollow points will cycle well in an AR?

December 14, 2018, 07:56 AM	#14
Rembrandt Senior Member Join Date: August 10, 2002 Posts: 2,108	10 round Lancer with a Tromix follower will give you a 4 round capacity magazine. They are definitely worth it. I have also put Tromix followers in 30 round metal GI mags, work well but stick out too far for my liking.

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