There are so many different names for these uppers but the common shared feature is these do not have the standard external threading for a barrel nut upon which a handguard would attach. In the LMT case the upper and handguard are one piece; for the others the front of the receiver extrudes...
So, I have this crazy, 338 Norma Mag Barrel from GAP/Bartlein that is a Gain Twist designed for some crazy monolithic solids and this week I was testing the latest batch.
The goal to was to check stability and make sure they actually hit the target. Basically speaking this was Phase One...