CGoodwin Posted September 17, 2011 Report Posted September 17, 2011 Hello all! Having some significant difficulties with my lower build. Picked up a DPMS LPK from Brownell's and I am having significant difficulties fitting parts in. The receiver extension tube won't thread in, even with moly grease. The bolt catch fits so tightly that it won't tilt, the takedown pins, well lets not even go there! Anyone else have so much trouble?
imschur Posted September 17, 2011 Report Posted September 17, 2011 Jeez man I have no advice but we dont seem to get any positive feedback about these IRA parts
CGoodwin Posted September 17, 2011 Author Report Posted September 17, 2011 It is a beautiful piece of work, but the LPK just won't fit! I may try taking it to my local gunsmith, but I hate to do so, throwing good money after bad. Then again, how can I in good conscience sell it, knowing it does not work? :-O
imschur Posted September 17, 2011 Report Posted September 17, 2011 I have seen difficult take down pins in both AR platforms. Does the IRA use the threaded bolt catch screw?.
CGoodwin Posted September 17, 2011 Author Report Posted September 17, 2011 Yes, and it fits fine. The bolt catch itself is too tight in the notch machined out for it.
Jgun Posted September 18, 2011 Report Posted September 18, 2011 I have no personal experience with the IRA receivers, but, if it were me, and I didn't want to sell it to someone with the caveat that they were on their own if they ran into problems, I'd start by getting some emery cloth of different grits, and hand fit the pins and bolt catch. I'm assuming you don't have a matched upper/lower set, because that should include the pivot and takedown pins. Look at it this way, If you polish the pins and bolt catch to fit. You should be able to get them to fit perfectly, with no slop but no drag either. I routinely use the oversize Armalite pins and polish them to fit when I'm assembling an AR-15 using an upper and lower from different Mfg, That way I can get a perfect, no slop fit between the upper and lower without having to resort to using one of this rubber wedges.
Robocop1051 Posted September 18, 2011 Report Posted September 18, 2011 Put the pins in a hand drill, or other rotary tool, and spin them in a bit of steel wool or fine grit emery cloth. You're not grinding, you're polishing. There's a difference.As for the Bolt catch, time to break out the itty-bitty file set and hand fit that S.O.B.
imschur Posted September 18, 2011 Report Posted September 18, 2011 as we all avoid the extension tube question..
CGoodwin Posted September 18, 2011 Author Report Posted September 18, 2011 Good thoughts. I went over everything with my Dremel with the felt polishers and jeweler's rogue to no avail, but I'll try some more tomorrow!
CGoodwin Posted September 18, 2011 Author Report Posted September 18, 2011 Also emailed Iron Ridge to see what they could do.
CGoodwin Posted September 24, 2011 Author Report Posted September 24, 2011 Great news! IRA is going to fit and assemble the LPK and the upper to the lower and the receiver extension tube for me. Looking forward to this build again!
98Z5V Posted September 24, 2011 Report Posted September 24, 2011 First time, so far, that I've seen them step up for a customer. I don't mean that in a bad way, but just the opposite - looks like they'll finally do something for their customers.
CGoodwin Posted November 7, 2011 Author Report Posted November 7, 2011 Actually, Oliver at IRA went above and beyond. He fit the LPK to the lower, discovered that my extension tube was out of spec, and he refinished my upper and lower for an optimal match! I am so happy and have finished my build. Here piggies!!!
98Z5V Posted November 7, 2011 Report Posted November 7, 2011 Actually, Oliver at IRA went above and beyond. He fit the LPK to the lower, discovered that my extension tube was out of spec, and he refinished my upper and lower for an optimal match! I am so happy and have finished my build. Here piggies!!!That, highlighted in red, was what I caught right away. I had to read your post two or three times to get everything, because that statement kept distracting me. That is something that they have had a problem with for a long time. Since introduction, really.
CGoodwin Posted November 20, 2011 Author Report Posted November 20, 2011 Actually, the tube was from Ace on an ARFX-E kit. My Magpul UBR tube fit perfectly in the IRA!
soofley Posted December 9, 2011 Report Posted December 9, 2011 Hmmmm... is this LPK not fitting right issue resolved yet? I really love the iron ridge set but after reading this, i'm getting second thoughts
CGoodwin Posted December 9, 2011 Author Report Posted December 9, 2011 Nope, fits fine and functions well.
98Z5V Posted December 9, 2011 Report Posted December 9, 2011 Iron Ridge had to fit that standard off-the-shelf lower parts kit to your rifle, though, didn't they?
CGoodwin Posted December 9, 2011 Author Report Posted December 9, 2011 Yes they did as well as modify the takedown pins.
98Z5V Posted December 9, 2011 Report Posted December 9, 2011 And those standard parts needed modified for what reason? Why didn't the parts fit into the lower that you already bought?That's kinda the question here - and the warning to others. Maybe they've fixed what they were doing wrong, but they were definitely doing something wrong for quite awhile. That's the whole point. If it's fixed, it's fixed - and new production from them should be okay. However, there are uppers and lowers out there that dealers may have been sitting on for a hell of a long time now - those might not work so well for consumers.Not bashing them - I hope they got it all together now. The buyer needs to beware, though.
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