Quote Originally Posted by Goohead View Post
I'm a huge Mega arms fan, after using several billet receiver sets I believe their machining is unmatched in tolerance between the pieces. I picked up 2 of these for projects and have been disappointed in a few items:

1 handguard Interior dimensions are already very tight, on the top section interior where the gas block would sit there are machined slots that protrude out a few tenth of an inch that makes anything but the smallest gas blocks unattachable due to hitting the top part. I was going to use a superlative arms piston kit and it's a no go.

The alignment pin to the top of the receiver did not align with 2 billet uppers i have one San tan tactical one fortis. Do not know if this piece is only for the mega uppers? Alignment is off by a hundredth of an inch.

Instructions says the use of this pin is not necessary but I would have preferred to use it.

Other than these issues the rail is top notch, just wish i could use a piston system like I originally intended to, which sucks


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I cannot help re: Alignment, but for the gas-block, I recommend the SLR Hodge Defense Gas Block which was designed at the same time the rail was, specifically for the rail. The other option is the Daniel Defense Lo Pro, but the SLR is a better fit.