AP5 100º LP Woes
Ran my factory AP5 for 250 rds of WWB 124gr nato through HK, MKE, and Mora mags all without issues.
Getting prepared for a can and decided to swap in a genuine HK 100º lp, extractor, and extractor spring. I also added a SB5 folding brace while awaiting approval for something better. First time shooting today with that setup (still unsuppressed) and had immediate FTF (feed) issues with open bolt on every single round fired. Re-installed the factory MKE LP and had no malfunctions for the remainder of range time, 150 rds.
Stock bolt gap - 0.27 mm
HK 100º lp gap - 0.51 mm
I realize the resulting bolt gap is right at the threshold of acceptable. Would this have caused my issue? On much of my research, it seemed the 100º lp is so often recommended for both suppressed and unsuppressed use on AP5's. I was surprised at the troubles I had with it. I know I could change rollers to lessen bolt gap, I guess I just wasn't expecting that from the 100º lp.
I appreciate everyone's time and insight on this.