AR-15 BS Thread

The only polymer lower I trust is the GWACS Cav-15's/Whatever KE Arms is gonna call them. Fixes the issues with polymer lowers by integrating the stock with the lower, so no receiver extension threading to strip out/break.

 

Made a set of hardwood upper vise blocks to properly torque my barrel but after it came loose at the range a couple of weeks ago. Everything lined up at 30 ft/lbs with a couple of the shims. Should be good to go now.

 

I'm building my first. Anyone have suggestions for quality stripped upper around $50? Or have suggestions about which one's to stay away from?

 

Aero is good stuff, consider one of their builder's kits and/or an M4E1 upper and handguard. A little easier to gunsmith and significantly more solid, but also a wee bit heavier and more expensive than normal setups.

 

Decided to try a LaRue MBT-2S straight bow trigger. Always leaned towards Geissele, if you haven’t already tried a LaRue you’ve been missing out. These triggers are great!

 

I really want to get a good flat face trigger to replace the Mil-Spec in my SBR.

 

I’ve got a Geissele SD-E on my 11.5 BCM SBR. Paid $220 plus tax/shipping for it. It’s a really good and reliable trigger. But this LaRue and my Geissele feel just the same.

 

At $80 I'll have to try it!

 

I’ve got a Gei

You’ll be highly satisfied with it. I really feel this trigger is an upgrade from most aftermarket triggers I’ve pulled.

 

Good to know! Put one in my pistol lower but haven’t received the geissele upper I ordered on Black Friday

 

AimSurplus single stage AR trigger

 

Me and my son, with the help of a friend, built 2 AR's for Christmas. Both Aero Precision upper, lower, and hand guards with Magpul furniture. His is 5.56 mine is 7.62x51. His has a Rosco barrel mine has the Faxon pencil barrel. I didn't go el cheapo on these builds but everything I bought was on sale or a package deal except for the MBUS pro sights. And I still came in just under 2k for both rifles.

 

Those Faxon Barrels are dope. My buddy has a 5lb naked rifle he put together with one, shoots 1.5-2MOA with bulk 55gr and really improves the balance.

 

Aero are solid and make for other under contract.
If you want a billet for under $80 try dark hour defense.
I like mine.
But from experience do not use clamp receiver blocks when building.
https://www.tacticallink.com/dark-hour-defense-billet-ar15-upper-receiver-black.html

 

Why not use a clamp receiver block? I was debating getting one, but I’m on the fence since I don't see using it a lot.

 

Because there can be various slight size differences between manufacturers of cast, forged and billet.
A clamp block can bend things.
Brownell and others make blocks that hold by the pins.

 

I'm a big fan of reaction rods if you're not a gorilla. The magpul block is probably my favorite though, as it is both a reaction rod and upper support, very user friendly.

 

Anyone ever had damage to a muzzle brake or flash hider? This is the factory muzzle brake on my FN15 rifle. Still tight as can be. Took a rifle class last night and went to clean it and noticed the damage. The only difference I made was a new brand of ammo. I've had thousands of rounds fly just fine before last night. Took to my gun store and he said it was crap ammo. Either the jacket was breaking apart and hitting the muzzle brake or the ammo was yawing just enough to strike it. Everything last night was fast and within 50 yards. I did notice 1 hole in my target that was keyholed. Anyone have an idea? Or what to do next? Still waiting to hear back from FN unfortunately. If I can't get this done fast or free I will probably put on a regular flash hider to use up the last 1k rounds of this ammo before putting a new brake on.

 

Lots of possible factors. How many rounds through the barrel thus far? Old barrels keyhole something fierce.

What ammo/twist rate? 77gr out of a 9 twist barrel is only marginally stable in good conditions.

The brake still looks functional, I'd pull it and throw on a FH until you finish off this batch then go back to it.