Am I looking at a gas block problem?
Hi Folks,
I'm trying to troubleshoot a no-name 16" mid length upper. Every so often the bolt does not hold back after last round. Also I'd say every 20-30 shots the firearm cycles ok (spent case ejects), click, no bang, and there is no cartridge in the chamber. I've played with buffers, tried different ammo, bolt, entire lowers and magazines.
Do the pictures mean anything? I am assuming (very novicely) that the gas block is somehow not in spec and is leaking gas and/or was not installed properly...
2nd picture is the same as the 1st, but I suspect there is gas leaking in the highlighted area? I am not technical savvy to decipher them. Also does the gas port look ok?
Thanks in advance...
http://i.imgur.com/WK1WiFu.jpg
http://i.imgur.com/14syvOY.jpg
Fixed lingering issues - thanks all!
Greetings folks,
Here's an update to an earlier thread I started which many helpful members here chimed in and gave opinions. Original thread for reference: https://www.m4carbine.net/showthread...-block-problem
I finally had a chance to reassemble the upper and took it to the range. I've installed a better gas block, new gas tube and had the barrel dimpled by a professional to accommodate the new gas block. Not sure if blue was the right way to go but I loctited the gas block screws pretty tight.
I am happy to say that after 60 rounds earlier today (40 American Eagle + 20 Brown Bear) I had zero extraction, ejection, cycling problems. Tried with a single round in the magazine about a dozen times and the bolt locked back every single time. Tried with 2 magazines to be on the safe side - a 2nd Gen Magpul & a H&K one. Zero fails...
I also noticed something else on the inside of the handguard when I took the upper apart to replace the gas block & tube. See the areas marked with the arrows? They were in the vicinity of the gas block and just accumulation of what I guess to be burnt powder. So unless a little bit of gas is really supposed to seep out of that region, it was definitely a leak / poor seal...
http://i.imgur.com/oiPPxdp.jpg
http://i.imgur.com/RIYIzea.jpg
http://i.imgur.com/8kU9Gee.jpg
Thank again all!
Cheers