I bought a GA 3-lug interface to use with my two In Lead We Trust muzzle device adapters (one regular, one 'navy' style). When I received the interface it would not slip over either adapter, not even close. I measured everything and found the following:
OD of muzzle devices: 0.5900"
ID of interface: 0.5885"
I asked GA what the specs were on the interface as this seemed a little low. They said .590" on the low end and .590" + .0012" on the high end with most parts held to the .5907", being gauged every few parts for quality control. After asking for an exchange, they obliged and sent me a replacement. Unfortunately, that one also did not fit albeit a little better, measuring .5890"
Even though this one is also technically out of spec I really don't want to play the RMA-game a second time. I called GA customer service to ask if there was something that could be done (polishing, honing, etc) or if it needed to be returned. I was told I could fit the interface by sanding the inside with some fine grit sandpaper.
Has anyone else had this problem?