My 10.5 LMT has been reliable but I noticed the rate of fire often starts slow and goes faster as the magazine is completed.
I used a rate of fire-meter and it averaged just 650 RPM -- which I feel is on the slow side. My guess is that the slow rate of average fire is what makes it erratic.
Win Q3131 ammo
Wolff extractor spring
H-buffer (I think 3.7 ounce)
I am not sure how to speed up the rate of fire except to use a non-H buffer -- but then I would be worried about bolt bounce.
I forgot to say --
With a sound suppressor (AAC SCAR-SD) it ran at about 950 rpm
With a Noveske KX3 flash suppressor it ran at a consistent 750 rpm -- and was perfect.
So I would call the Noveske the fix -- it made it non-erratic -- except I want to keep the AAC flash hider on it and be able to use it with or without the sound suppressor. So I need another kind of fix.