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The Range
Gunsmithing & Repairs
light primer strikes on my 6.5 Grendel, not the lower...
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<blockquote data-quote="zghorner" data-source="post: 2971285" data-attributes="member: 35089"><p>Went shooting yesterday and had 2 or 3 light primer strikes out of 60 rounds fired. All factory Hornady ammo. I use the same lower for a 5.56 AR shooting mostly cheapo steal case and never have a hiccup. I know the hammer spring is on correctly and I just don't really suspect the lower to be the problem.</p><p></p><p>The upper was bought complete from a friend and has only had (less than) 300 rounds through it. I have had issues since I got it with FTE and now the light strikes. I added an O-ring to the extractor spring as well as an adjustable gas block and now it is running much much better.</p><p></p><p>WHAT EXACTLY IS HAPPENING: pull the trigger -> click (round did not fire) -> rack the bolt -> ROUND DOES NOT COME OUT -> if I pull the trigger again it will shoot like normal operation -> If I rack it again instead of pulling the trigger it will pull out the unfired round with a small depression where the firing pin struck it.</p><p></p><p>A few things to note, the bolt is pretty abrasive while moving/rotating in the bolt carrier. The carrier looks to be chrome to me and has some poor machining inside where the bolt is. I smoothed it up with some lapping compound but it still is sub par IMO...that carrier is hard stuff.</p><p></p><p>What I think is happening is the bolt is not going into full battery but I am no expert obviously. Where should I go from here to solve this issue? extractor too stiff? recoil spring too weak? I'm running a rifle buffer setup with new spring. </p><p></p><p>thanks in advance for any advice.</p></blockquote><p></p>
[QUOTE="zghorner, post: 2971285, member: 35089"] Went shooting yesterday and had 2 or 3 light primer strikes out of 60 rounds fired. All factory Hornady ammo. I use the same lower for a 5.56 AR shooting mostly cheapo steal case and never have a hiccup. I know the hammer spring is on correctly and I just don't really suspect the lower to be the problem. The upper was bought complete from a friend and has only had (less than) 300 rounds through it. I have had issues since I got it with FTE and now the light strikes. I added an O-ring to the extractor spring as well as an adjustable gas block and now it is running much much better. WHAT EXACTLY IS HAPPENING: pull the trigger -> click (round did not fire) -> rack the bolt -> ROUND DOES NOT COME OUT -> if I pull the trigger again it will shoot like normal operation -> If I rack it again instead of pulling the trigger it will pull out the unfired round with a small depression where the firing pin struck it. A few things to note, the bolt is pretty abrasive while moving/rotating in the bolt carrier. The carrier looks to be chrome to me and has some poor machining inside where the bolt is. I smoothed it up with some lapping compound but it still is sub par IMO...that carrier is hard stuff. What I think is happening is the bolt is not going into full battery but I am no expert obviously. Where should I go from here to solve this issue? extractor too stiff? recoil spring too weak? I'm running a rifle buffer setup with new spring. thanks in advance for any advice. [/QUOTE]
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The Range
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light primer strikes on my 6.5 Grendel, not the lower...
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