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Posted: 3/4/2016 1:51:15 PM EDT
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i recently put my first lower together and topped it with an upper that was preassembled
its a 300 blackout with and 8.5" barrel cleaned and lubed everything and took it to the range for its first firing not a lot of ammo to choose from at any of my local gun shops it was either some super high priced hornady or fiochhi ammo i went with the fiocchi ammo as it was half the price per box and i got 50 rounds vs 20 rounds it 150 gr fmjbt ammo i shot a couple of rounds and then i had a round that extracted but didnt eject and got stuck in the breech with the next round trying to load underneath it well i cleared it after a couple more rounds it did it again. then i tried a different mag and same results. its never consistant sometimes i can fire 5 rounds and every thing is fine,sometimes it does this with the first round that is fired. i removed the BCG and inspected everything,all looks good i then took an empty case and installed it in the front of the bolt and let go the case just kind of fell of the front of the bolt and dropped on my lap. did this several times and every now and again it will actually throw the empty case 3-4 feet away,but not every time so i removed the BCG from another AR and tried this, and it will throw the case every single time so i know the issue must be with the ejector is there any way i can remove and inspect the ejector from the bolt asy? i dont know what brand the BCG is,i got the upper asy from JSE surplus next time i go to the range i will be taking a BCG from one of my other AR rifles along and comparing them in the pistol to make sure it is the BCG asy thanks in advance for your input |
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so i removed the BCG and cleaned and lubed it meticulously
didnt remove the ejector assy as i still dont have a tool for it went to the range today,also took along my colt light carbine AR in .223 i started off shooting the 300 blackout pistol had the same issue with the ejection of spent cartridges will pull the case from the barrel and drop it in the breech and then try and load another round very inconsistant with this problem,sometimes i can shoot many rounds from a mag with out a hiccup.sometimes its the first round tried several mags with the same results swapped the BCG with the one from the colt same issue in the 300 as with the original BCG asy but the 300 BCG works flawlessly in the colt,as does the colt BCG in the colt not seeing any gas leakages any where on the gun so am i right in saying this must be an ammo issue? as always thanks in advance for your thoughts/opinions |
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Do you have the spring, insert, and o-ring under your extractor? Because it's probably your extractor, not the ejector. The extractor isn't getting a good hold on the brass, letting it slip, gas pressure is still high enough to extract the round. But since the round isn't being held against the bolt face by the extractor, the ejector can't kick it free.
Get this. It should clear up your issues. |
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Quoted:
Do you have the spring, insert, and o-ring under your extractor? Because it's probably your extractor, not the ejector. The extractor isn't getting a good hold on the brass, letting it slip, gas pressure is still high enough to extract the round. But since the round isn't being held against the bolt face by the extractor, the ejector can't kick it free. Get this. It should clear up your issues. thanks for you input it does not have the o ring couple more q's if that was the problem then why does the BCG work flawlessly in my Colt? could it be because of it having a longer barrel and being 5.56/.223? the colt BCG does the same thing when installed in the 300 blackout i see in the description it says it does improve extraction on short barreled rifles since my barrel is only 8.5", would this be why neither of the BCG's seem to work perfectly in the 300? i guess i could just order four kits and install them on all my AR rifles, cant hurt i guess |
| When you fire, the brass expands, grabbing the walls of the chamber. Normally extraction occurs after the brass has relaxed, making extraction much easier. On pistol and sometimes carbine length gas systems the brass hasn't fully relaxed when extraction begins. So if the extractor doesn't have a good grip on the rim, the case can slip off the extractor. Gas pressure is still high enough to drive the case out of the chamber. Sometimes it will still eject by bouncing off whatever it manages to hit. Other times it will just stay and end up jamming things up. |
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Quoted:
just out of curiosity, did you use the same bullets second time around? I have ejection issues firing 120grain bullets out of my blackout, but no problems with 147grain+ bullets. yup,only thing that i changed was the bcg after it kept doing it once i cleaned and lubed the original bcg |
| since you know the bolt carriers works fine in your other rifle try a different brand of ammo. Remington 147gr should be around the same price as the fiocchi. you can also try ozarkordnance.com. this has been a mixed bag. my brother has had issue with one out of every 100 or so. so far i have had zero issues with them. |
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You might want to try a heavier Buffer. I was having feeding issues with my AR-16 pistol using both my 300BLK and 556 uppers. My Buffer Tube is a Carbine length one (7" long internally).
After a suggestion on this site, I ordered a heavier Carbine H2 Buffer (a little heavier - 4.6oz vs 3.0oz). My problem went away. I did also get a different Bolt Carrier, but I think that the heavier buffer made the difference. Just my 2 cents worth. |
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