I need learned opinions about an issue that I came across this weekend while dialing in a Grendel Build from last winter – 2017-2018. (I know, I know – finally got round to it – first time on the range had never been shot before. Lots of life events last year kept me from getting this out to shoot. Anywho…………)
- PSA blem lower
- MBT trigger group
- Aero upper – 18in stainless barrel
- Monmouth – Nickel Boron BCG
- BCM Vlotor Charging handle
So, I finally get to the range to dial in the Nikon Monarch 3 4-16x42 scope and ran into some issues.
- First problem were FTF the first round off the mag – only loaded 2-3 rounds because I was sighting. This was a 5 round mag (forget the manufacturer – C Industries? maybe), so I slap the mag to get it to seat and continue to get some issues picking up the first round. Was using Wolf steel case, so I chalked it up to maybe those are not friendly or maybe the mag is not fitting correctly since it was very inconsistent. I brought a box of Federal Fusion, so I switched over to see if the Brass would make it better. Still some issues – (my thought – Damn mag isn’t seating correctly – should have ponied up for the more expensive mags – my bad for trying to go budget). Should also add that I had several misfire/light strikes on the Wolf ammo.
- Second – more concerning problem. After a couple of rounds, I had the bolt lock back, so solidly that the bolt would not move, the bolt release was not activated and could not be moved. Further, when I tried to push the takedown pins, they were really, really tight, everything was bound up. I managed to get the front pin disengaged –bolt springs forward once the pressure is relieved. Rear pin came out at that point normally. I separated the two halves, inspected them for obvious signs of a problem – nothing(admittedly, I am not sure what I’m looking for anyway, but thinking aluminum shavings etc.), so I reassembled. A few shots later, same thing. Pins were jammed again. Was able to get them out eventually, but much more effort than is normal. At that point, I was somewhat dialed in – about an 1.5” low and ½” right at 25 yards – could have used some tweaking, but at least close. I ended the session since I didn’t know how to remedy it.
I was struck when I first mated the upper and the lower that they really fit tight, no slop, very solid – TOO Solid/Tight?
I am a neophyte in the world of ARs, so I’m asking those who have more experience if you can point me in the right direction.
Thanks in advance for your thoughts.