AR15 unknown problem

[Mail Clerk]

Well I'm not sure how to check the bolt besides the gas rings. They are not lined up. Also, both the bolt and upper are mil spec so I see no reason why they shouldn't be compatible.

gunguy123,

The gaps in your gas rings should be staggered so no leaks occur. Put a drop of oil on those rings before you resinsert it back into the bolt carrier. In fact since the bolt is apart give it a good cleaning anyway. One area of importance is check the gas key and make sure it's tight!!! If it's loose you need to retighten it down and if you can restake them. That alone could be your issue right there.

Like the orhers have saif try using a 55 grain bullet. I've never used anything under 55 and I'm betting the 45's are used for bolt guns instead of semi automatics.One thing abour the AR system it's simple BUT everything tied to the gas system must be tight. Any little leak and your done.

Mail Clerk

[missiontrails]

I sent a new upper back to the manufacturer for a specific reason, and they insisted that I include the BCG that came with it. When I got it back, I had a one shot rifle.... pulled out the BCG at the range, and discovered that the entire gas key was loose and wobbly.... I could fit a credit card between the key and the carrier. NOT the one I sent back..... my point is check that well... if bolts are not entirely tight.. tighten them and stake the crap out of it. This WAS my loose one:

[supersonic]

I love the "run it wet" comments.

Oil dripping from the carrier does......NOTHING, other than get oil all over the FCG and in the lower well.

There are only four slim areas that contact the carrier to the receiver wall. THAT needs the lube, and it does not need to be dripping wet.

A little on the bolt contact ring, a little on the bolt cam pin, and go shoot. Oil anywhere but on the contact surfaces is wasted and messy.....unless you really enjoy cleaning dirty gunk out of your rifle.

FYI, running your bolt "wet" is just another way to say "make sure your BCG is not DRY "(i.e. properly lubed). No one said anything remotely close to your "dripping" reference.

[gunguy123]

Ok thanks guys I will check all the things you mentioned with the BCG. However, I cannot replace the buffer or lower at this time. I just need to make sure the BCG and upper are functioning correctly. If the BCG is occasionally double loading I will know that the buffer and therefore the lower is the problem.

[Gunsrruss]

Hammer Spring

Make sure your hammer spring isn't in upside down. It adds more stress to the Bolt carrier when it comes back to reset the hammer. That problem fixed both of my rifles.

[Army]

FYI, running your bolt "wet" is just another way to say "make sure your BCG is not DRY "(i.e. properly lubed). No one said anything remotely close to your "dripping" reference.

You've been here long enough to know that what I wrote, is what 'they' mean by wet. Did you see the "...lube your bolt and carrier really well. Use some good quality grease. I learned this the hard way. AR bolts have to be run wet." comment? That is not recommending it be lubed correctly or by the manual.

BTW...he did NOT learn

[gunguy123]

Well I went to the range yesterday and I used 55gr PMC. There was no short-stroking at all. The only problem the rifle had was double feeding, and that is because I have the wrong buffer tube.

[cutty01]

Glad you sorted it out. Did you mean to say buffer tube or buffer?

[gunguy123]

I need to replace both. I'm getting a BCM lower.