Out of 2 PTR-91s ,the initial bolt gap shrank very quickly.
From .016 to .008 after around 700 rounds .
One now has a tiny indent now between where the trunnion
and receiver are.
I believe there was initially a very tiny space here,and shooting it
tightened the gap,causing the shrink in gap and making the indent.
This indent is barely visible ,in the 5-10 thousandths category wide,
and less deep,maybe 1/8 inch long .On both sides of the receiver
just above the weld.
I've seen other PTRs with the exact same thing.
That said ,she gets 1.5 inch 100 yard groups with Federal Match,
and around 2 inches with port.Slightly more with SA ,but still under
2.5 .
Never a single Jam ,FTF ,FTE ,nothing.
Flawless function ,and I mean flawless.
I've tested her with some really crappy ammo to,and this
rifle eats anything !
Does anyone that knows there HKs think the tiny indentation is
something to worry about ?
It hasn't changed now in an additional 500 rounds ,and since the bolt gap
hit .008 inch ,it hasn't moved.
Sights have stayed dead on.