Building Confidence

[Grizzman]

I've read some negative comments on M4Carbine.net about Sharps Rifle Company BCGs, with one individual stating that he's read of a bunch more. Considering the fully vetted nature of Colt, LMT, and BCM bolt carrier groups, I see no reason to stray from these for a serious build. They're readily available for around $180. They haven't been around as long as the above, but Sionics and Centurion both offer great BCGs, with Sionics units costing less than the others.

Geissele trigger groups are fully awesome, and I doubt you'll find many people that would disagree. Don't let the low price of the LaRue MBT-2S fool you into thinking it's not worth considering. I've got quite a few of them, and they compare very favorably against my SSA.

The easy buffer/spring answer is to get an H2 and Colt or Sprinco Blue spring. The Sprinco should greatly increase service life, but Colt springs are cheap enough to replace multiples before reaching the $22 price of the Sprinco. I may have read that Geissele's spring is only supposed to be used with their buffer.

A lot of people swear by the A5 system, and it does work smoothly. I've got more A5s than carbine receiver extension, and most of the carbines are part of 1st generation Magpul UBRs.

Today, BCM has just released their enhanced upper receiver. It's got thicker than standard walls for strength, differences in internal shape to modify gas flow (for suppressor usage), etc.

Since the release date wasn't known, or if they'd even be offered as a stripped receiver, I ordered a VLTOR MUR-1A late last week for a precision-ish 6.5 Grendel build, and it arrived today. I'm not going to finalize the upper assembly until a friend arrives for the holidays, but the machining and finish are definitely top tier.

[RKP]

https://gunmagwarehouse.com/blog/ar15-tools/?utm_source=gunmagwarehouse&utm_campaign=b3e92d3d9 8-EMAIL_CAMPAIGN_2019_12_30_07_39&utm_medium=email&u tm_term=0_0d355b7f6d-b3e92d3d98-424065977&goal=0_0d355b7f6d-b3e92d3d98-424065977&mc_cid=b3e92d3d98&mc_eid=bc07c9b816

http://www.cotep.org/forum/showthread.php?p=169805#post169805

[Grizzman]

I recently swapped a couple 308 AR barrels, which gave me a reason to use the Geissele Gas Block Roll Pin Tool. It made starting the roll pin extremely easy. I wish I'd purchased it years ago (if it was available before now).


Bending 1/16" punches is definitely something I do well, so I'll be getting their punch set at some point.


https://geissele.com/tools/gunsmithi...ock-tools.html

[Caleb]

It’s going to be a personal preference to what you want for your first build. If you feel more confident with the more expensive upper/lower then, by all means buy that one. If you plan to resell your build once you are tired of it, you will get more buyers with the higher end components. Otherwise, buy the Anderson. They are made to Mil-Spec specs and the fit and finish are excellent. It’ll work just as good if not better than the units costing 3x the price. From my experience, I don’t feel the need to buy the higher stuff.


Sent from my iPhone using Tapatalk

[Caleb]

Buffers..... Buy a standard mil-spec buffer and spring and you will be fine. If your rifle doesn’t cycle properly then, that’s where you need to troubleshoot why. Could be not enough gas or partially blocked gas port. Too heavy/light of a BCG. Ect...... the buffer would be the last thing I would check.


Sent from my iPhone using Tapatalk

[Caleb]

Headspace............ honestly, I’ve only checked one rifle. But, don’t do as I do....lol. Gauges are cheap and easily available so just go ahead and buy one. It’s super easy to check and to be honest 99% of the time your mil-spec parts will be within the proper headspace range.


Sent from my iPhone using Tapatalk

[RKP]

Any progress

[Gatorade]

Palmetto State Armory has sales daily. Let me know when you are ready to build. I may be able to help you out with tools. Also my last few builds have used vice grips to squeeze pins in instead of pounding. A bunch easier and less chance for damage.

[Gatorade]

https://palmettostatearmory.com/palm...roup-8779.html

BCG $69.99

[Gatorade]

https://www.aeroprecisionusa.com/ar1...-receiver-blem


https://www.aeroprecisionusa.com/m4e...-anodized-blem

If you have time you can wait for blemished parts and save a bunch. The first scratch during assembly will be more noticeable than any blemish.

Also they have some dirt cheap prices on blowout keymod handrails.

Plus you can get 10% off your first order. I believe free shipping over $100.