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Posted: 3/13/2013 8:42:46 AM EDT
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Like many AR shooters, I'm just getting into the .22LR AR game due to ammo availability and costs. I'm working towards building a dedicated upper to mate to my Spike's NiB bolt, but in the mean time I'm using the Spike's unit with the o-ringed chamber adapter in m y 14.5" Colt. At 50 yards, I was quite pleased with my groups from the standing. I haven't done any accuracy tests from the bench yet, but I'm happy thus far. Anyway, my buddy has a dedicated upper and recommended me this Taccom pressure plug, to save my lower from being beat up. Is this common when running conversions? Do all of you run them? It seems like cheap insurance, and I don't want to damage my super rare (  , LOL) LEO marked LE6920 lower. |
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I've only recently put my .22 together (about 200 rounds through it so far) and I have a p plug in it. I ran it both with and without and I can't really tell the difference while shooting. However, the theory behind it makes sense and since its cheap and available, I'd rather have one than not have one- just in case.
My only complaint is that the newest ones have a different shape on the end. Instead of a conical point like in the pics, it looks more like a flat edge with a small mound right in the middle. Tim told me that this was to combat premature wear that the earlier ones had. My issue is that the edge of the kit gets caught up on the area build in between the flat edge and the mound, making it impossible to close the upper and lower without a tool to push the p plug back first. I'm thinking that this might change with continued use and probably won't happen to everyone. Ymmv in this regard. |
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Thanks for the comments. While I agree with the idea that it's cheap, so why not. I don't want to spend money if I don't have to. Anyone had some pics showing the wear/damage than can be caused by a .22LR bolt on the lower? koin, To be honest, I thought about having my buddy turn one quick out of aluminum.
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Quoted:
Thanks for the comments. While I agree with the idea that it's cheap, so why not. I don't want to spend money if I don't have to. Anyone had some pics showing the wear/damage than can be caused by a .22LR bolt on the lower? koin, To be honest, I thought about having my buddy turn one quick out of aluminum. If you can source something locally for less, go with it. As has been said previously, it's cheap insurance, and I think the concept is more important than the particular product - especially if you're using it in an SBR or transferrable MG lower. I've got a dedicated barrel and the kit locks up tight (unlike when it's used with a chamber insert), but I still run one - I was going to pay for shipping on one of his firing pins anyway, so I went ahead and got the whole "reliability kit." -bob |
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Quoted:
Thanks for the comments. While I agree with the idea that it's cheap, so why not. I don't want to spend money if I don't have to. Anyone had some pics showing the wear/damage than can be caused by a .22LR bolt on the lower? koin, To be honest, I thought about having my buddy turn one quick out of aluminum. Its not so much about preventing wear on the lower as it is about keeping the bolt in place so its not wiggling around which could lead to malfunctions. The whole thing about damaging the lower is nice and helps with the selling of these things but lets be honest its not that big of a deal. Having a bolt that wiggles around is a big deal and can lead to malfunctions. |
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The pressure plug puts positive pressure against the rear of the frame rail. It keeps the frame from moving under recoil.
Different tolerances in uppers and bcg's can leave a gap at the rear of the frame rail and end of the upper receiver. This lets the bcg move which can cause light strikes, feeding problems, ect. It also keeps the bcg from battering the upper. Very good, inexpensive up grade. Dave N |
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Quoted: The pressure plug puts positive pressure against the rear of the frame rail. It keeps the frame from moving under recoil. Different tolerances in uppers and bcg's can leave a gap at the rear of the frame rail and end of the upper receiver. This lets the bcg move which can cause light strikes, feeding problems, ect. It also keeps the bcg from battering the upper. Very good, inexpensive up grade. Dave N Thanks Dave. I asked my machinist buddy if he had any scrap aluminum laying around to make me one. He whipped this up for me last night.  Haven't tried it yet (as in firing the rifle with it installed), but I like the idea of Aluminum versus polymer. Seems to fit perfect. My Spike's kit fits tight with the o-ring chamber adapter, but I figured why not. Free is for me  I told him he should make up a bunch, LOL. Thanks for the help everyone. eta: clarification. |
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Polymer yes......however it is DELRIN and is actually tougher than aluminum.
Nice job there......good for personal use. We do have a patent pending on the pressure plug......but that doesn't effect someone wanting to get by on the cheap and gettin one made for themselves. Bare aluminum tends to gall things up in the buffer tube after a spell. The extra cushion DOES keep the Bolt assy from pounding the back of your lower.......some people use 2.....especially the FA guys. Tim |
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Quoted: Polymer yes......however it is DELRIN and is actually tougher than aluminum. Nice job there......good for personal use. We do have a patent pending on the pressure plug......but that doesn't effect someone wanting to get by on the cheap and gettin one made for themselves. Bare aluminum tends to gall things up in the buffer tube after a spell. The extra cushion DOES keep the Bolt assy from pounding the back of your lower.......some people use 2.....especially the FA guys. Tim Thanks for the input Tim. I didn't even think about galling, so I'll have to keep an eye on that. i also didn't realize yours was Delrin (never heard of that before). Thanks for being nice about me copying your product, I didn't think about a patent. My appologies on that. If i buy one of your M4 style barrels, can we be friends? ETA: I think I'll order Tim's reliability kit, and maybe that barrel. I feel pretty bad now  |
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I have one that I put in my Spikes lower/Chiappa upper.
The Chiappa (probably short for ChinesePooPoo) had bad hole alignment for the takedown pins. I had to run a twist drill through the rearmost hole. It's not exactly sloppy but the fit could be better. I noted a scissor action at the front takedown pivot under recoil. With the Taccom plug its eliminated. Closing the halves is a little bit of a hassle. The bolt rear face gouges the Delrin and makes it hard to close unless I depress the plug somewhat. The plug I received doesn't have the conical face. It has a button type protrusion in the center. I doubt the profile change would make any difference anyway. |
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Quoted:
Polymer yes......however it is DELRIN and is actually tougher than aluminum. Nice job there......good for personal use. We do have a patent pending on the pressure plug......but that doesn't effect someone wanting to get by on the cheap and gettin one made for themselves. Bare aluminum tends to gall things up in the buffer tube after a spell. The extra cushion DOES keep the Bolt assy from pounding the back of your lower.......some people use 2.....especially the FA guys. Tim Tim, I could probably find this info by digging through the archives, but will the parts other than the plug in the reliability kit work in a Spike's dedicated upper assembly? I know that Spike's uses a variant of the Ceiner design, but didn't know if their mods were compatible with your parts. I bought an unused complete M4 style upper on the Equipment Exchange in January and am trying to get everything set before taking it to the range for the first time. I think I have the essential parts on hand, but you kit seems to be well thought out for improved function. |
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Quoted:
Quoted:
Polymer yes......however it is DELRIN and is actually tougher than aluminum. Nice job there......good for personal use. We do have a patent pending on the pressure plug......but that doesn't effect someone wanting to get by on the cheap and gettin one made for themselves. Bare aluminum tends to gall things up in the buffer tube after a spell. The extra cushion DOES keep the Bolt assy from pounding the back of your lower.......some people use 2.....especially the FA guys. Tim Thanks for the input Tim. I didn't even think about galling, so I'll have to keep an eye on that. i also didn't realize yours was Delrin (never heard of that before). Thanks for being nice about me copying your product, I didn't think about a patent. My appologies on that. If i buy one of your M4 style barrels, can we be friends? ETA: I think I'll order Tim's reliability kit, and maybe that barrel. I feel pretty bad now
No apology req'd, everything is very cool. I'd probably do the same thing.....prior to all this, I always had access to machine shop equipment, I've made alot of 'stuff' for myself. The TACCOM firing pin will not work in the old spikes from what I've been told......It may with grinding another flat in it, but I do not have that dimension. Tim |
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