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Posted: 7/29/2013 4:39:43 AM EDT
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ok so i have my RLL set up in an a2 20 host for the last few weeks since i have had it. this weekend i decided to fit it to my 11.5 upper for some short and loud action.
it ran fine no issues but when i opened the gun and took the link out the paddle was bent the other direction aka the bend was going twords the rear of the gun??? has any one ever seen that before should i be worried? the link and prtector seemed ok nothing jumped out at me but it sure does seem odd. rof was nice and using an h3 buffer. the only diffrence between the set up is the 20 upper had a shrouded bcg that i milled back while the 11.5 i was using a colt sp1 bcg with un shrouded. but i cant see how that would matter. i can take some cell phone pics later |
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Shouldn't happen that way.
Most of the fatigue wear on the paddle comes from the initial bend, so if you go moving it around between uppers or even different carriers with the same upper, that's gonna shorten paddle life. I keep a separate paddle for each upper I use with a link. |
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Only think I can think of is that the paddle is somehow makeing a connection to the carrier when it is coming backwards on the recoil stroke and bend the paddle backwards over the back of the lower.
I would assume if this was happening you have some pretty good marks in the radiused section of the lower where the rear takedown lug seats into the lower right in front of the buffer retaining pin and the paddle is using as a pivot point to be bent backwards. Are there any marks on the 11.5 SP1 carrier itself where you could see contact being made with the paddle, especially along the underside of the hammer cutout? The other test you could run is swap the carriers. Put the 11.5 carrier in the 20" with the paddle bent back (or a new paddle) and the 20" carrier in the 11.5" upper (migrate the bolts between them to keep headspace intact) and see if the problem reoccurs and if the problem follows the carrier to the alternate upper or stays with the 11.5" evern with the previously unproblematic 20" carrier. |
| You could also use a black sharpie to coat the edges of the link paddle and the underside edges of the carriers. That way if it is making contact it should be more easily visible as the sharpie ink will quickly get scrapped away. revealing the parkarising or shiney metal underneath. Its also easy to remove the rest when you are done with some spray brake cleaner. |
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spent some more time looking at it today couple observations
1) there is a mark in the lower behind on the "self" behind the take down pin which make sence is the carrier is forcing it backwords 2) does any one here with a RLL run and actual sp1 carrier and use 6 position carbine extension? i think item 2 is the problem when i compare the lenght of my original 4 pos extension to the new 6 postion it is about a half inch longer. i think that travel coupled with how the sp1 carrier is milled for the unshrouded firing pin causes the problem. |
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Quoted:
2) does any one here with a RLL run and actual sp1 carrier and use 6 position carbine extension? i think item 2 is the problem when i compare the lenght of my original 4 pos extension to the new 6 postion it is about a half inch longer. i think that travel coupled with how the sp1 carrier is milled for the unshrouded firing pin causes the problem. All carbine receiver extensions should be the same dimensions, regardless of the number of stop holes for the stock body. If the tube is too long, that certainly could be a problem, both for your link paddles, and your upper receiver, since the carrier key will be slamming into the extension tube receiver ring mighty hard on every counterbattery stroke. The only receiver extension I know of that's actually longer on the inside than a carbine receiver extension, but still looks like one is the VLTOR A5, which comes with a special buffer weight. The A5 basically uses a slightly shorter full weight rifle buffer in a space only about 1/2" longer than a standard carbine receiver extension. You definitely want to bust out a tape measure and check the internal receiver extension depth. |
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well upon closer examination I figured it out
the paddle was just hitting the back of the firing pin cut out. I measured it and it was .02 taller than my other carriers. I also found corresponding spots on the paddle. the buffer tubes were within 1/8 of an inch of each other so may be some of it to here are some pics of paddle and carrier before I take a little dremmel action to it. |
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well took a dermal to it cleaned up the firing pin cut out. and put 2 quarters in the extension to take up the 1/8 inch difference
seems nice and free in dry fire testing will run it on Saturday if we don't get any rain. I think it was a stacking tolerances between the 2 areas |
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