AR Sponsor
Posted: 8/24/2009 4:52:36 PM EDT
| ok my pistol is doin what i believe is a short stroke. It shoots 5.56 flawlessly. But when i start shooting .223 it will not chamber the next rnd. It appears that the bolt is only being kicked back far enough to extract/ eject but not far enough to feed a new round. I keep seeing something about the o-ring in the bolt... Does that fix it? If so where do u place the o-ring? Thanx for the help |
|
From what you're describing, putting an O ring under the extractor (around the extractor spring) isn't going to solve your problem. You're syaing your bolt carrier group isn't moving back far enough. An O ring isn't going to make your carrier launch farther back.
|
|
Quoted:
I was trying to avoid that but thanx. Starting to think the pistol is more of a pain and might have to fo back to the m4 Send it to ADCO if you don't want to do it yourself. I did mine and it runs 100% but ADCO can tune it perfectly and they do excellent work. |
|
Did you build it yourself? What type of .223 ammo are you using, grain weight? Was it the case that you shot 5.56 perfectly and as soon as you chamber .223, every single round jammed, then when you go back to 5.56 it starts working again? If you load just a single .223 round, the the bolt lock back?
To start, check for gas leak. Use lighter buffer (standard carbine) if you are using heavier one. Al |
|
Load one round in the mag, fire it and see if the bolt stays back. Do it a few times. If the bolt consistanly locks back on the open mag, it's not short stroking. If it does not lock back, you have a gas problem.
The o-ring on the extractor has nothing to do with gas pressure. Only enhances extraction. |
|
First off start with the basics.
Have you field stripped it and cleaned it thoroughly? Did you check to make sure the 3 gas check rings are not lined up making a gap? I don't know how many AR owners I've met that have never even field stripped their AR. If you don't now how... learn how tonight, it's not that hard. If you know how to do Build an AR from a bare receiver with nothing but a pocket knife, well then this tip was for the next newbie that reads the thread. Don't discount your magazines as a possible cause. If you have several extra mags try them all. A healthy coating of CLP or other lubrication on the bolt and carrier will definitely help. Just be careful to wear eye protection and hold it away from your face for the first 5 -10 rounds so you don't get a face full of CLP . Also before you attribute it to .223 VS .5.56 what grain ammo are you using. I've found that 62 grain FMJ ammo is consistently the most reliable in all of my ARs followed by 55grain FMJ. Try the 1 round in the mag lock open test that was suggested. |
| Thanx for all the input, I'll try the 1 round thing. I have tried several buffers, no luck on that. As far as the ammo is concerned, I have used a mixture, ALL the 5.56 works fine, the .223...mostly black hills....wont fire more than 1 round. I have tried federal, same problem. I know how to field strip, lol. 9 years in the Army made sure of that. When I first got t about a week later I was having problems with 5.56 and discovered the set screws on the gas block had come looses, I realigned it and use lock-tite. If it helps here is a pic. Thanx again.http://i262.photobucket.com/albums/ii101/k9kaboom/ArPistol.jpg |
|
Quoted:
Thanx for all the input, I'll try the 1 round thing. I have tried several buffers, no luck on that. As far as the ammo is concerned, I have used a mixture, ALL the 5.56 works fine, the .223...mostly black hills....wont fire more than 1 round. I have tried federal, same problem. I know how to field strip, lol. 9 years in the Army made sure of that. When I first got t about a week later I was having problems with 5.56 and discovered the set screws on the gas block had come looses, I realigned it and use lock-tite. If it helps here is a pic. Thanx again.http://i262.photobucket.com/albums/ii101/k9kaboom/ArPistol.jpg Have you tried 62gr .223? I don't know what gr BH and Federal you've fired. If you had a gas block screw loose before, I am leaning more towards that now. What low profile gas block do you have on there? I found that the MI gas block with 3 screws worked a lot better than 2-screw LP gas blocks by other manufacturer. Also, make sure that the hole is properly aligned if you are going to fool around with the gas block. Al |
| You may want to re-check gas block, I'd measure the distance from the shoulder to the gas port on the barrel and the same measurement on the gas block to ensure that they line up. l'd also check to be sure the gas tube isn't partially blocked when it's inserted into the gas block. Slight difference's in how manufactures measure and produce items don't always ensure proper line-up. A partially covered gas port could be a possibilty seeing you just had to adjust it. |
|
Quoted:
Thanx for all the input, I'll try the 1 round thing. I have tried several buffers, no luck on that. As far as the ammo is concerned, I have used a mixture, ALL the 5.56 works fine, the .223...mostly black hills....wont fire more than 1 round. I have tried federal, same problem. I know how to field strip, lol. 9 years in the Army made sure of that. When I first got t about a week later I was having problems with 5.56 and discovered the set screws on the gas block had come looses, I realigned it and use lock-tite. If it helps here is a pic. Thanx again.http://i262.photobucket.com/albums/ii101/k9kaboom/ArPistol.jpg What buffer tube is that? |
AR Sponsor