LMT 12' (Is it the best piston upper?) Ft. Brian McNeilly Lmt Shovelnose Upper
Short answer, it will work with any MRP-L barrel (i.e. 5.56, 300BLK) that's longer than the upper. So yes, 12" or longer barrels will work, LMT PISTON PROBLEMS CONTINUE LMT AR15 vs. KAC SR15 Accuracy Comparison 1st LMT Build - Will Shovelnose Upper Work With DI Barrel? : r ...