I have an OPS 12th I bought from you a few years ago, and would like to set up a couple more uppers to use it.
Finally got my SBR stamp back, so want to do a SBR upper. Would like to use a low profile gas block (say Troy from your website) and keep the barrel as short as possible. My math gives 8.5" of barrel+ clearance for mounting the 12th (2.5"?). Would be a 11" if its 2.5" of clearance, 10.5" if 2" of clearance. Am I in the ballpark, and do you have the adapters and brake in stock for this?
Also have a M4 barrel coming in that I want to use the 12th on. I'm planning on buying the AEM brake from you, do you have a collar available that will work with the standard M4 profile or will I need to send the barrel in to be reprofiled?
Lots of questions I know.