Building a Recce/SPTR typish AR - Need BCG

Yoshi · Jun 16, 2017

Most components are Mega Arms: Lower, upper, barrel, hand guard... I know bcg's aren't critical to accuracy, but I want a good one. Will the BCM BCG with fitted HPT/MPI Bolt be a good choice? Anything else I should think about?

Edit Title: ...Recce/SPR...

jimbobborg · Jun 16, 2017

Young's National Match BCG. Consistency is critical to accuracy, so it does actually matter.

OrbitalEllipses · Jun 16, 2017

jimbobborg said:
Young's National Match BCG. Consistency is critical to accuracy, so it does actually matter.

Shrug. I run a SIONICS NP3 BCG because I shoot my 20" primarily suppressed. Accurate enough. Doesn't need some out-of-spec BCG to make it more accurate.

sailskidrive · Jun 16, 2017

For a SPR a good quality BCG is all that is needed. Now if you're competing F Class/etc you would want a bolt that is matched to the chamber...

I just had a gas key come loose on a Wilson Combat BCG; a little annoying considering the premium they charge for their goods with the expectation that the finished product has a greater attention to detail.

jimbobborg · Jun 16, 2017

OrbitalEllipses said:
Shrug. I run a SIONICS NP3 BCG because I shoot my 20" primarily suppressed. Accurate enough. Doesn't need some out-of-spec BCG to make it more accurate.

I had one installed on an SPR, saved my face when a OOB round went off. https://www.rainierarms.com/young-mfg-national-match-bolt-carrier-group/

Yoshi · Jun 18, 2017

Found one made by Rubber City. Seems like a good one.

outrider58 · Jun 19, 2017

sailskidrive said:
For a SPR a good quality BCG is all that is needed. Now if you're competing F Class/etc you would want a bolt that is matched to the chamber...

I just had a gas key come loose on a Wilson Combat BCG; a little annoying considering the premium they charge for their goods with the expectation that the finished product has a greater attention to detail.

You'd be shocked to find out how many gas keys on reputable BCGs fail testing.

OP, just try and avoid NiB BCGs and make sure the bolt is HPT/MPI and that the bolt cylinder and gas key orifice are both chrome lined. Have head space checked as well.

travistheone · Jun 19, 2017

the BCM bolt is an excellent choice. refreshing to see people posting about something other than whatever is cheapest.

clandestine · Jun 19, 2017

Yoshi said:
Found one made by Rubber City. Seems like a good one.

Their Adjustable Gas Keys leave much to be desired. I believe they use 9310 for the Bolt instead of c158.

Nitride can make the bolt more succeptible to breakage and the treatment is inferior to a chrome lined/phosphate coated Carrier.

GAL700 · Jun 19, 2017

Yoshi said:
Most components are Mega Arms: Lower, upper, barrel, hand guard... I know bcg's aren't critical to accuracy, but I want a good one. Will the BCM BCG with fitted HPT/MPI Bolt be a good choice? Anything else I should think about?

Edit Title: ...Recce/SPR...

Will be using the same BCM bcg in my first AR build :party29:

, starting on the upper at this point. Far from being Clandestine on here just going on reviews and BCM has great customer service. For me the bcg in an AR is like the motor for your car. Everything else like suspension, tires, exhaust and hp brakes are not worth a damn if you have a shitty motor that doesn't consistently run. Rifle accuracy isn't going to matter if you can't get the bullet down the barrel. Good luck on your build.

Building a Recce/SPTR typish AR - Need BCG

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