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Posted: 5/31/2010 12:15:17 PM EDT
| I have a Spikes 16" 9mm with the Spikes Heavy buffer......at times I will shoot a few rds and then have an FTE with the casing seemingly stuck on the bolt. I know a couple other guys wrote about this recently. I followed another thread where it was suggested to swap out to a regular carbine buffer.......so I went out today with every intention of doing that. Brought my St22 along and was going to swap lowers to see if there was a difference. I shot with the heavy buffer first and didn't need the swap, I didn't have a single issue so now I'm lost. I did remember that last week I swaped out a YHM rail with a DD Omega 9", I took the barrel off the 9mm due to the jam nut/barrel nut YHM combo. I'm sure this had no affect but I can't explain why I did not have this issue again. I shot 100rds of 9mm flawlessly. Usually it happens once of twice while going through a 32rd Uzi mag. |
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There's a lot of variables with 9mm ARs. The ejector needs to be tweaked to the proper position to ensure reliable ejection. The extractor needs to hold the case firmly to the bolt. When new, parts can be a little tight/rough and need some break in. Weak ammo can cause FTE issues in new builds. Incorrectly assembled lowers and/or lowers that don't pass function checks can cause issues. There are also a host of questionable parts out there that weren't out there a few years ago.
If you do your part and function check and hand cycle rounds to ensure function before firing and then break the gun in, it should be good to go within a few hundred rounds - less if you use WWB or hotter ammo... Some guns may even run 100% from the first round on. YMMV... |
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It's also a good idea to go a little heavier with lube on a new gun. As Kevin says, parts need to break in, and extra lubrication helps that-and reduces stoppages caused by those new parts wearing on each other.
So I'd start with more lube, and then check out the ejector, which is one of the more finicky parts of a Colt-style 9mm setup. |
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Quoted:
It's also a good idea to go a little heavier with lube on a new gun. As Kevin says, parts need to break in, and extra lubrication helps that-and reduces stoppages caused by those new parts wearing on each other. So I'd start with more lube, and then check out the ejector, which is one of the more finicky parts of a Colt-style 9mm setup. Yep - I have always had good luck with "lighter" lubes like CLP or Mobil1 - stay away from any kind of thicker, grease-like lubes. |
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