UPDATED: 04/11/2015; still having issues; see latest post.
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I recently bought a DPMS AR-15 A3 upper assembly to swap onto my functioning AR15 carbine but I got a FTF on almost every round; the bolt would catch on the side of the new round and jam, leaving the round stuck out of battery.
I thought the buffer spring might be a problem so I replaced it with a CS flat spring and the problem continued.
Am I obviously missing something to remedy this problem?
Exact upper info is: Midway USA Product #: 810366, DPMS #: FTBL-LR-20 Fluted 1x9
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I recently bought a DPMS AR-15 A3 upper assembly to swap onto my functioning AR15 carbine but I got a FTF on almost every round; the bolt would catch on the side of the new round and jam, leaving the round stuck out of battery.
I thought the buffer spring might be a problem so I replaced it with a CS flat spring and the problem continued.
Am I obviously missing something to remedy this problem?
Exact upper info is: Midway USA Product #: 810366, DPMS #: FTBL-LR-20 Fluted 1x9
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