09-06-2021, 01:24 AM
JP Bolt tail measures pretty much .225 on the nose.
Carriers both permit a .252 pin to barely pass but a .253 fails to start in that part of the carrier. So.. not as tight as I would wish for, but still within reason and normally good function.
Carrier does not impact the lower receiver at full buffer spring compression (ie - when the buffer makes contact with the rear of the buffer tube) and ever so slightly depresses buffer upon shotgunning the receiver closed.
When swapping a .223/5.56 upper onto the lower - things work as planned and the .223 did the pew pew thing as expected. As I have several lowers making effective pew sounds I'll swap something in and see if there is any difference.
I haven't been able to find a 6mm arc gas port chart at this point - still a bit new I think. I'll email Rainier on the port size but won't hear anything till Tuesday I'm sure.
Carriers both permit a .252 pin to barely pass but a .253 fails to start in that part of the carrier. So.. not as tight as I would wish for, but still within reason and normally good function.
Carrier does not impact the lower receiver at full buffer spring compression (ie - when the buffer makes contact with the rear of the buffer tube) and ever so slightly depresses buffer upon shotgunning the receiver closed.
When swapping a .223/5.56 upper onto the lower - things work as planned and the .223 did the pew pew thing as expected. As I have several lowers making effective pew sounds I'll swap something in and see if there is any difference.
I haven't been able to find a 6mm arc gas port chart at this point - still a bit new I think. I'll email Rainier on the port size but won't hear anything till Tuesday I'm sure.