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Posted: 6/6/2014 7:07:02 PM EDT
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Hi all,
Building my first AR pistol, I am down to the very last part to install, my hammer. Everything else went fairly smooth but the hammer has a spring that blocks the hole partially, I assume to retain the pins. The gun is a Mr Blond Build from KAK Ind., great people, great service! CAL- .300 AAC Blackout I finally gave up and removed the hammer, I took a punch and Drove the pin thru the hammer. It took a good smack w a 2lb dead blow hammer and punch to get the pin past the spring. I figured if I left the pin in the hammer it my be easier to install it after 24 hours. What is the Trick here? What am I missing? I have installed custom trigger groups and none have had the retainer spring inside the hammer pin hole. I have kept trigger group factory on 2 rifles, I have a JP trigger in another rifle that I installed. This stock hammer installation breaking my thumbs and is breaking my Balls, also it's got a super strong hammer spring. I am about to give up and get a drop in CMC trigger group. I really don't want to order a trigger, lots of cost already in the build. Pistol built on SI-Defense billet upper Lower set. |
| This is one of the problems with KNS pins. I had to "nudge" mine in (more like pound it in) due to the same issue. Normal hammer/trigger pins are slightly rounded on the ends (which helps installation), while the KNS hammer pin is NOT (you cannot use the rounded cone insertion tool for the hammer pin). It has a squared edge, and if it catches the hammer J-spring the wrong way, can cause damage. Keep finessing it in (use a plastic screwdriver back or something) but do not just slam it in. I've stop using KNS pins for this very reason, as I'm afraid of damaging that J-spring (plus I've grown fond of the "smooth side" look of not having them). |
| Even if you use the stock pin as a guide, it will still hang up on the hammer J-spring, as the KNS pin is square edged with another square edge for the "slot" that engages the bar. It's just not "install friendly" and will hang up on that J-spring no matter what you do. My first build uses them, but I'll not use them again (unless I need them) as it's just too hard on the J-spring. |
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Insert the KNS pin with the tang parallel to the j-pin.
When the j-pin stops on the shoulder of the hammer pin rotate the hammer pin to allow the tang to move the j-pin out of the way. I also use a slave pin on the other side to keep things more or less straight. |
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