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I've got 2 carbines with the RRA triggers. I didn't use the included pins in either carbine. I hate to ream out something that doesn't need it and is not able to be put back to original condition.
On another note I did have a new, reputable lower that I was building on and had to use .155 KNS pins to get proper fit. Tolerances are a bitch sometimes.
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I recently removed my RRA NM2 trigger from my Bushy lower. I replaced the factory trigger and pins. Now the hammer pin is very loose. I can fairly easily push it out with my finger. Would KNS.155 pin sets be the best fix?
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The .155 would work since they also are secured but since you already had the .156 pins in there they will go back just fine as long as they will go through the FCG, which they should. I would try the .156 pins with your trigger and hammer. If you can get them in, you are good to go. If not the .155 KNS will fix it.