The BCM Mod 4 latch is slightly larger than a standard GI latch and has a slick finish. It's stronger by design and at $45-$50 it's not a cost prohibitive upgrade. I don't see a reason not to buy one.
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The mod 4 latch is a lot bigger than the GI. The Mod 5 is the small one. The Mod 3 latch is ridonkulous.
It's not that much larger.
Which one do you use Dustin?
Mod 4s on everything.
Nice. Have you messed with the Raptor?
I'll bring it when I pick up my can. I need to check the fit on the upper anyways. I might still need you to machine a spacer.
I'd like to check one out. How thick does the spacer need to be and I'll make it. Measure the diameter of the barrel behind the shoulder and I'll make it match flush.
I measured it at one time but I don't have them anymore. I know the wrench flats on the blackouts work with my rail and barrel length. I know its .750 at the gas block, and its a little smaller infront of the gas block to the shoulder. Just make it whatever diameter and about the same thickness or a little thicker than the wrench flats on a blackout.
I have a barrel stub I cut off a colt I bet matches. Probably make it .200" thick. Will still have plenty of threads. You only need like 6 threads for full strength. 28 tpi at .400 long you still have 11 threads engaged. gives you plenty of room for the relief in the mount and shims. Assuming the relief groove in the mount is .075 (it's shorter than that) and we use enough shims to turn it 360* (we won't) you'll still get at least 8 threads engaged which is plenty.
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