Hello all, and happy Thanksgiving!!
Well I went to do some pre-Turkey Day shooting yesterday with my Peepaw down by the creek.
My PTR-91 did NOT perform properly!! Keep in mind, I've fired almost 700 rounds up to this point, all good for the most part, but I just recently changed rollers for my bolt. It turns out my bolt gap had gone to about .005" from when it was new, but the gun was cycling properly. That seemed kind of on the low end. So I did some reading, and it appears the "ideal" bolt gap for these is something like .015", so I bought some +2 rollers from HK parts and installed them in the rifle. The bolt did indeed measure about .015" when I checked it after the install.
Now I went to shoot it for the first time yesteday, I was using Tulammo 150 grain steel cased stuff. This has worked reliably in the past for me. So, I chamber a round and BOOM! went off just fine. Then, I pull the trigger and "click"... no go. So I work the action again, making sure to lock the bolt back and slap the charging handle. The gun chambers fine and again, fires, but then a failure to fire on the next round. So, the gun is chambering the round and firing it, but it appears the bolt maybe is not closing all the way on the next shot.
I can see a slight 1/8" or so gap in front of the bolt after firing. However, I can still pull the trigger and this sometime leaves a small mark on the primer, but it doesn't set the round off. It seems that the gun is just not chambering all the way, and only chambers properly during manual manipulation of the bolt.
The gun was very clean, I make sure to scrub out the chamber after each range session so I don't think it's that. Do you think the larger rollers are causing this? If so, why? Should I go back to the small rollers? This is very strange, and if anyone knows how to fix this, please let me know. Thank you all so much, and have a great Thanksgiving!!
V/r
Earl
Well I went to do some pre-Turkey Day shooting yesterday with my Peepaw down by the creek.
My PTR-91 did NOT perform properly!! Keep in mind, I've fired almost 700 rounds up to this point, all good for the most part, but I just recently changed rollers for my bolt. It turns out my bolt gap had gone to about .005" from when it was new, but the gun was cycling properly. That seemed kind of on the low end. So I did some reading, and it appears the "ideal" bolt gap for these is something like .015", so I bought some +2 rollers from HK parts and installed them in the rifle. The bolt did indeed measure about .015" when I checked it after the install.
Now I went to shoot it for the first time yesteday, I was using Tulammo 150 grain steel cased stuff. This has worked reliably in the past for me. So, I chamber a round and BOOM! went off just fine. Then, I pull the trigger and "click"... no go. So I work the action again, making sure to lock the bolt back and slap the charging handle. The gun chambers fine and again, fires, but then a failure to fire on the next round. So, the gun is chambering the round and firing it, but it appears the bolt maybe is not closing all the way on the next shot.
I can see a slight 1/8" or so gap in front of the bolt after firing. However, I can still pull the trigger and this sometime leaves a small mark on the primer, but it doesn't set the round off. It seems that the gun is just not chambering all the way, and only chambers properly during manual manipulation of the bolt.
The gun was very clean, I make sure to scrub out the chamber after each range session so I don't think it's that. Do you think the larger rollers are causing this? If so, why? Should I go back to the small rollers? This is very strange, and if anyone knows how to fix this, please let me know. Thank you all so much, and have a great Thanksgiving!!
V/r
Earl