AR15 BCG & accuracy

DutchV · Mar 31, 2018

So I'm doing an SPR build with a Black Hole Weaponry barrel and an Aero enhanced upper. I've got a PSA Premium BCG on hand. Is there any accuracy advantage to going with a better BCG from a better known maker? Like say an Aero nitride BCG?

dist1646 · Mar 31, 2018

kalister1 · Mar 31, 2018

If you are after extreme accuracy, have a Gunsmith custom fit your Bolt to the barrel.

ToolAA · Mar 31, 2018

DutchV said:
So I'm doing an SPR build with a Black Hole Weaponry barrel and an Aero enhanced upper. I've got a PSA Premium BCG on hand. Is there any accuracy advantage to going with a better BCG from a better known maker? Like say an Aero nitride BCG?

I’m by no means an AR-15 Guru but to answer your question more directly I don’t think there is any accuracy advantage to getting a different BCG.

The Nitride coating will increase the surface hardness of the parts it should not have any impact on the accuracy. The dimensional tolerances of the bolt/lugs and fit to the barrel breech will determine headspace and could have some impact on accuracy/repeatability. All other wear and tolerances related to the BCG would more likely impact long term mechanical reliability, not necessary accuracy.

If you haven’t already upgraded the trigger I think you’ll get more accuracy per dollar spent there.

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GuitarmanNick · Mar 31, 2018

If you are looking for accuracy on an AR15 using 5.56/.223, your best bet would be to invest in a high quality 20" barrel with a 1:7 or 1:8 twist rate. Outside of that, not much can be done on an AR15 to maximize accuracy IMHO.

DaemonAssassin · Mar 31, 2018

DutchV said:
So I'm doing an SPR build with a Black Hole Weaponry barrel and an Aero enhanced upper. I've got a PSA Premium BCG on hand. Is there any accuracy advantage to going with a better BCG from a better known maker? Like say an Aero nitride BCG?

Lapping the upper makes a world of difference with a good barrel, as does bedding the barrel into the upper. I have a lapping tool and almost every other tool you could need, if you want to slide over and do the build at my place.

DaemonAssassin · Mar 31, 2018

GuitarmanNick said:
If you are looking for accuracy on an AR15 using 5.56/.223, your best bet would be to invest in a high quality 20" barrel with a 1:7 or 1:8 twist rate. Outside of that, not much can be done on an AR15 to maximize accuracy IMHO.

BHW makes damn good barrels for the buck. Lapping the upper and bedding the barrel into the upper make a difference on accuracy, especially if the barrel is floated.

3paul10 · Mar 31, 2018

+1 on what DaemonAssassin said.

outrider58 · Mar 31, 2018

Like many here are getting at, though a good quality BCG is essential for a happy gun(Carpenter steel MPI tested bolt, chrome lined carrier and gas key, etc), it takes a lot more to get that gun shooting to its maximum capabilities. Start at the ground and work your way up.

Mike3888 · Mar 31, 2018

Have no worries on your barrel choice. I have guite a few BHW barrels and they all shoot great. As other posters replied about bcg you'll be gtg. Just and a good trigger and have at it.

DutchV · Mar 31, 2018

DaemonAssassin said:
Lapping the upper makes a world of difference with a good barrel, as does bedding the barrel into the upper. I have a lapping tool and almost every other tool you could need, if you want to slide over and do the build at my place.

Thanks for the offer. I agree about lapping most uppers. The Aero Enhanced upper is a bit different.

https://aeroprecisionusa.com/ar15-m4e1-enhanced-upper-receiver.html

The face where the barrel seats is recessed inside the big mounting lug for the free float tube. Aero says further lapping is not necessary for this model.

Bedding the barrel extension is also on my list for this build.

jimbobborg · Mar 31, 2018

Young's National Match BCG for best accuracy. You get the M-16 BCG for reliability.

OLM-Medic · Apr 1, 2018

GuitarmanNick said:
If you are looking for accuracy on an AR15 using 5.56/.223, your best bet would be to invest in a high quality 20" barrel with a 1:7 or 1:8 twist rate. Outside of that, not much can be done on an AR15 to maximize accuracy IMHO.

That's not really true though. Longer means more velocity, not necessarily more accurate.

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