Originally Posted by
Duke
I didn’t mean to seem rude
Crappy barrel lock up will manifest, in my experience, in sporadic accuracy variances rather than full kabooms.
Examples - with a 5” M&p core 2.0, with an RMR and an 11 pound spring it tracked like butter smooth but - at 100m you could put 5 of 6 on a C zone steel - the 6th round would often be 2 feet high and right. The next mag, first round would be off again by a foot with the next 5 hitting as they should.
Put a 13lb spring in and it was solved. Again no kabooms