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8/9/2016 8:45:04 PM EDT
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8/9/2016 9:02:10 PM EDT
[#1]
Is it lubed up good? What upper receiver? Have you tried to mortar it yet? Assuming it's not chambered, or the rounds that is chambered has been spent.

Had it cycled live ammo at all? Or is this the first live round, and then stuck? Or, is this the first live round chambered, no shots taken, only hand cycling?

8/9/2016 9:53:50 PM EDT
[#2]
Tomorrow is first firing, got it lubed up good but I might give it some mobil1 synthetic to help. Its a mega arms maten upper/lower. After a few raps it came loose, just wondering if its doing it because is new and unfired...
8/10/2016 12:11:39 AM EDT
[#3]
When you cycled, did your oil the charging handle ask the way back, and let go completely, allowing the spring to do is job? Or did you possibly ride it home with your hand?

I use castrol 10w40 on my rifles. Synthetic will be just as good.

Possible the barrel chamber is tight. Rainier ultra match have pretty tight specs. Try cleaning it really good with a bore brush.
8/10/2016 12:52:10 AM EDT
[#4]
Good question, and Yes I did. Fully charged no riding. I will give it a serious scrubbing again just to be sure.  
How wet do you normally leave your bcg when getting ready to shoot?
8/10/2016 10:30:07 AM EDT
[#5]
Quote History
Quoted:
Good question, and Yes I did. Fully charged no riding. I will give it a serious scrubbing again just to be sure.  
How wet do you normally leave your bcg when getting ready to shoot?
View Quote


Especially in a new build or new factory delivered AR I run the BCG and sliding components a little wetter than normal.  It's not at all unusual to encounter a little break-in in some new AR's of any caliber.  The kind of "break-in" I'm talking about is usually within the first 10-12 shots.  An AR continues to break-in up to 200 shots in some cases but not the kind of issues that interfere with cycling and reliable operation.  Those are usually, or at least should, clear up within a few shots.  And I'm not making it sound like the AR platform is some kind of cobbled together, roughly manufactured rifle.  It's just that occasionally many AR's take a handful of shots to "smooth out", if that's an acceptable definition of what I'm trying to describe.  After that if the problem continues, there's likely a long term issue that needs to be addressed.
8/10/2016 12:39:16 PM EDT
[#6]
Personally, on brand new builds or factory new guns, i run them dripping wet. Where after the first few shots, oil is oozing from every crevice. I leave it like that for 2-500rds before first major cleaning. That's only if everything is looking good. I check all the components after the first full mag, then after 2 mags, then after 3,etc until i get to 500rds. If i see something that needs attention, i clean it up and check it more in depth.

If Rainier has a break in procedure, follow that while you check out everything else as well.

ETA: I don't mean check after every single mag. After reading again, that's what it sounds like i was saying. But i meant after 1 mag, check things, then after the third, then after the v6th, then 10th, etc etc until i get to 500. Then it's time for an in depth inspection of the wear.
8/10/2016 12:53:54 PM EDT
[#7]
Good input, thank you
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