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Yeah, but the Mega setups kick ass - they look great, lightweight, great finish, tight tolerances, etc...Originally Posted by roberth
I've been giving serious thought to starting a new project with a single Mega Ambi lower SBR'd and a pair of matching Mega uppers for it, one a 12.5" 308, the other a 22" 6.5CM....
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Last edited by DireWolf; 03-24-2016 at 17:32.
New development. I bought an M5 Aero Precision "enhanced" LPK when I built this rifle about five months ago. I put 160 rounds through it and today the bolt catch/release broke on the last round. This was kind of a spendy LPK for AR-308's. Has anyone ever had this happen before?
I haven't had it happen, but I have seen a handful of cases posted where the Aero bolt catch broke.
I broke a second bolt catch. Turns out using a .308 buffer and .308 buffer spring with the suppressed 6.5Creedmore upper was causing the spring to get too much tension because of the neck on the .308 buffer. Switching the buffer with a no neck AR-15 buffer in the same weight fixed it so it has less recoil, easier charging, and hopefully no more breaking of bolt catches.
Thanks for posting back. I hope that fixes it. I'm not following you on the "neck" of the buffers. Are you running a rifle extension or carbine extension?
Rifle A2 tube. The 308 buffer has a neck/ring where the spring sits that is not against the buffer head like a carbine buffer. I'm not great at knowing different sizes and weigh combinations but the new buffer I'm trying weighs the same but is shorter. The old 308 buffer had and inch or two of tension on the spring just sitting in the tube not even being charged back. This more tension was needed to charge or cycle the rifle thus causing more forward force on the bolt and shearing the bolt catch. That my theory anyway.
Here is the 308 buffer. See the lower ring? That's where the spring was before.
Ok, I follow you now. Thanks for the pictures. The overall length of the AR-15 rifle buffer longer, right? Can you get the bolt to hold open when you use the AR-15 rifle buffer?
Be careful not to go too short, either. I have seen pictures of the damage when the carrier impacts the receiver extension threads at the back of the receiver.
Which AR-10?
The AR-15 buffer is shorter than the one pictured and the spring seats at the far end, not on a ring 2inches down. The one shown is the AR-10 buffer. I'm basically using a shorter buffer with the same weight instead of the pictured buffer.
Last edited by belizejet; 05-07-2016 at 17:10.
Sounds like your bolt catches are made very poorly. I like a lot of Aero's stuff, but after 2 have broken, I wouldn't be putting any more in.
I've never had a bolt catch break using the appropriate rifle buffer in a .308 A2 configuration.
Are you saying you put a carbine style buffer in your rifle with the A2 tube still?
Looks like this?
If so, that is a bad idea. The shorter buffer will allow the larger diameter of the body of the bolt carrier to impact the threaded portion of the lower receiver, which can cause damage to the threads, and eventually can cause the lower receiver to crack at the base of the buffer tube hole.
I bought a DPMS from a guy that had put a carbine buffer in an A2 rifle buffer tube, and the carrier had dug into the buffer tube threads about a 1/4 of an inch.
It's your gun, do as you wish, but understand that they are designed with that buffer for the rifle A2 tube for a reason.
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