Bear Creek Arsenal....opinions from owners

Talk about the AR15 style rifles chambered in 450 Bushmaster.

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Re: Bear Creek Arsenal....opinions from owners

Postby Ronv69 » Sat Mar 16, 2019 10:15 pm

I have a BCA 16" upper that looks really good and seems to shoot well. I got it sighted in, but the cartridges keep catching on the lip of the 7 round Bushmaster magazine. I got the follower from Tony and I have a Lancer magazine in the mail. Lots of fun to shoot. Best group after I got it sighted in was about 3/4 inch at 50 yards with a cheap red dot sight that I could barely see. I know I can do better.
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Re: Bear Creek Arsenal....opinions from owners

Postby Ronv69 » Sun Mar 17, 2019 5:58 pm

MarkTJ97 wrote:Recently got their 16" 450 Upper with 15" handgaurd. Fit very well onto a PSA-15 lower, no wiggle at all. Looked great too.

Unfortunately, the gun would not cycle, feed or eject! I tried all the tips I found on this site and nothing worked.

Finally decided to take it apart and measure the gas port. It was supposed to be .076" per specs but was actually .067". I stepped it up to .0785" (#47) and put it all back together.

Range results were absolutely perfect! Ran 80 rounds with no issues, ejected all 80 in a nice pile around 3:30/4:00 position. Accuracy with the Leupold 450 CDS Scope was impressive.

I would buy more from BCA but I would be ready to inspect carefully. I really should have returned the upper but I don't mind tinkering a bit. For my needs as a casual shooter/hunter BCA fits the bill just fine. Good luck with yours!


Mark, what buffer are you using? I had the same problem when I first shot mine using an H3 buffer. Putting the stock buffer back fixed it.
Do you think it's possible that they limited the gas on purpose since this cartridge runs a narrow range of bullet weights and doesn't run subsonic?
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Re: Bear Creek Arsenal....opinions from owners

Postby bellwilliamaudie » Fri Apr 05, 2019 3:20 pm

We purchased a .450 Bushmaster complete upper assembly from them, we ordered a regular model with the dust cover and forward assist. They sent us the side charging handle and that receiver is thicker and more robust that the standard model. It usually has a $30 higher price tag but they sent it for no extra money and we are SUPER PLEASED with the upgrade!!!

I purchased a 5.56mm NATO (1 in 7 twist) barrel from them for under $50 (as an upper project simply to make my AR more versatile.) I am VERY pleased with the quality although it is a heavy barrel until the gas port where it steps down to a regular thickness barrel which is kinda' odd. But for the price we can't argue at all!

My Brother bought his .300 Blackout 16" heavy barrel from them last year (and made his upper purchasing a little at a time as he could afford) and he is supper pleased! When he had a question like how long a gas tube he needed for the barrel he purchased or the diameter of the gas port or what the recommended buffer for that configuration would require they were very helpful and never tired of his questions.

They are great people and we couldn't be happier!
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Re: Bear Creek Arsenal....opinions from owners

Postby plant_one » Sat Apr 06, 2019 12:54 am

bellwilliamaudie wrote:
I purchased a 5.56mm NATO (1 in 7 twist) barrel from them for under $50 (as an upper project simply to make my AR more versatile.) I am VERY pleased with the quality although it is a heavy barrel until the gas port where it steps down to a regular thickness barrel which is kinda' odd. But for the price we can't argue at all!




thats actually a fairly common barrel profile for the ar platform. its not just a BCA thing. most barrel makers i beleive call that a national math configuration. .920 to the block , .750 gas block journal and .700 (or even .675 or .650) out to the threads. it is a great balance between weight and rigidity.
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Re: Bear Creek Arsenal....opinions from owners

Postby bellwilliamaudie » Sat Apr 06, 2019 1:15 pm

I am VERY pleased with it, the only oddity I encountered was when we built a standard configuration barrel AR for my youngest Brother (who is now in the Marines;) his barrel is lightweight from the chamber end to the gas port and then looks like a heavy barrel from there to the flash hider...

My younger Brother says that the old timers he serves with said that others used to use the barrel of their M16A1's as a pry bar (usually on armored vehicle tracks) and would bend them.

However a new barrel for under $50, yeah I can live with unusual.
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Re: Bear Creek Arsenal....opinions from owners

Postby BIGDADDY » Sat Apr 13, 2019 4:41 pm

finally got around to shooting mine and man it is a keeper for sure!
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Re: Bear Creek Arsenal....opinions from owners

Postby bellwilliamaudie » Sat Apr 13, 2019 5:56 pm

BIGDADDY Superb, yeah mine shoots really well too. Must be some inherent accuracy involved because the .450b that I have and the ones I've seen on YouTube give outstanding groups! My .50 Beowulf isn't as accurate, it shoots well mind you, but the .450 just shoots better from muzzle to 100y.
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Re: Bear Creek Arsenal....opinions from owners

Postby BIGDADDY » Sun Apr 14, 2019 5:55 am

my groups off the bench were about a inch. I think the group would have been tighter if the holes were not so big lol! all three shot groups had overlapping holes. recoil is about like a deer slug or maybe a turkey load.
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Re: Bear Creek Arsenal....opinions from owners

Postby bellwilliamaudie » Sun Apr 14, 2019 5:16 pm

That is exactly our experience.
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Re: Bear Creek Arsenal....opinions from owners

Postby bellwilliamaudie » Sun Apr 14, 2019 5:40 pm

I have a Steyr Mannlicher Model L Deluxe with a hammer forged barrel in 6.5 X 55mm Swede that is about as beautiful a rifle as anyone could ever hope for; it came with a receiver mounted peep sight. After a little more than 2 years I was finally able to get a load that prints almost a 2 inch group out of it at 100 yards (and you have to really concentrate to get there!) Now I'll admit that it's a thin barrel but you could buy 4 AR's in .450 Bushmaster for what I have into the thing, and the 16 inch .450b with a BCA heavy Barrel out shoots it with ease!
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