So as a confessed obsessive tinkerer, I couldn’t leave the Mossberg alone. I took the thing apart probably 5 times already each time to try and fine tune the darned thing.
What I have learned so far.
First thing I noticed was tolerances on the Magpul fore end anti rotation insert is way too close. When I first installed it it was fine. But when I field stripped the rifle the first time I noticed I hadn’t tightened the castlenut down far enough. 8 rotations later it was hand snug. It binded a bit so I backed it off. I field stripped the thing, bent the elevator a bit so it centered better and put everything back together. Wouldn’t you know the pump stuck in the fully back position. I figure I munged up the elevator.
So I stripped the thing again, and took the time to look at all the parts. There was a bit of flash on the edges of the interrupters, the parkerizing was rough as well so I smoothed it all out. I also messed with the elevator again. Put it back together and the pump still stuck, especially if I slammed the bolt back with some force.
I figured I messed up the elevator so bought another one for 30.00 just in case I pooched myself.
Then last night I noticed wear marks on the barrel from the Magpul anti rotation ring. If it was wearing on the tapered front of the barrel it must be getting jammed on the breech end since it’s bigger. Sure enough there was some wear on the insert. I took a little off it and no more stuckage.
What I have learned so far.
First thing I noticed was tolerances on the Magpul fore end anti rotation insert is way too close. When I first installed it it was fine. But when I field stripped the rifle the first time I noticed I hadn’t tightened the castlenut down far enough. 8 rotations later it was hand snug. It binded a bit so I backed it off. I field stripped the thing, bent the elevator a bit so it centered better and put everything back together. Wouldn’t you know the pump stuck in the fully back position. I figure I munged up the elevator.
So I stripped the thing again, and took the time to look at all the parts. There was a bit of flash on the edges of the interrupters, the parkerizing was rough as well so I smoothed it all out. I also messed with the elevator again. Put it back together and the pump still stuck, especially if I slammed the bolt back with some force.
I figured I messed up the elevator so bought another one for 30.00 just in case I pooched myself.
Then last night I noticed wear marks on the barrel from the Magpul anti rotation ring. If it was wearing on the tapered front of the barrel it must be getting jammed on the breech end since it’s bigger. Sure enough there was some wear on the insert. I took a little off it and no more stuckage.