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10/20/2017 1:01:18 AM
9/22/2017 12:11:25 AM
Posted: 8/15/2005 2:51:58 PM EDT
I've read here on this forum that one can make a cheap action block substitute can be made using a magazine filled with epoxy (or whatever), or by using a 1x3 block of wood. This would certainly be adequate for holding a lower while assembling a LPK, but is it strong enough to use for assembling a barrel onto an upper receiver? Thanks in advance for input.
Link Posted: 8/15/2005 4:34:08 PM EDT
I would advise against using anything that locks in the magazine well for rebarreling an upper.
Link Posted: 8/15/2005 4:35:16 PM EDT

Originally Posted By M4Madness:
I would advise against using anything that locks in the magazine well for rebarreling an upper.

I second that!

Link Posted: 8/15/2005 7:39:47 PM EDT

I would advise against using anything that locks in the magazine well for rebarreling an upper.


Buy an action block set, it's worth every penny, even if you only use it once!
Link Posted: 8/15/2005 7:48:26 PM EDT
When building my uppers, I often pad the upper with a towel and clamp *gently* with a vise. Unless you're a brainless brute, you won't crush the upper; just the same, though, I insert a bolt carrier for extra safety. Closer to 7 or 8 (dis)assemblies now, with no problem.

Past that, I'm sure any of the Hometown folks would be glad to help.
Link Posted: 8/18/2005 2:29:38 PM EDT
I have found "heat" and "freeze" to work awesome. Used a sledge hammer one time, that worked kinda good, hmm hacksaw works great, all time best tool to hold an upper was done to me on my first AR-15 by a gunsmith, the put the barrel in a vise with no "barrel" jaws, just a vise and took the factory barrel nut off my Colt that I had for maybe 2 weeks, anyway he twisted the barrel extention this way and scratched the crap out of my barrel, That right there made me buy my own wrench and upper thingy.
Link Posted: 8/19/2005 8:29:35 PM EDT
Link Posted: 8/20/2005 9:59:10 AM EDT
Action block $35, new upper $115. Do the math!

I learned the hard way, when a new RRA upper was only $90 shipped.
Link Posted: 8/20/2005 11:30:32 AM EDT
lay it on the floor and lean into the wrench!
Link Posted: 8/20/2005 8:23:07 PM EDT
How good is the DMPS Upper Reciever Block is it as good as the NSN 4933-01-494-6732 Upper Receiver Actiob Block or better?
Link Posted: 8/20/2005 9:12:55 PM EDT
Is the DPMS the whitle Delrin model with the two pins? If so, that's the one I prefer.
Link Posted: 8/21/2005 11:30:47 AM EDT
[Last Edit: 8/21/2005 11:36:29 AM EDT by WILDBILL756]
Yes, the DPMS is the White plastic model with the two pins. I have never have use anyone. I Didn't know which one is the best to use. I have been thinking that the Military one NSN 4933-01-491-6732 Upper Receiver Block might be better. But, I could be wrong.
Link Posted: 8/21/2005 2:34:55 PM EDT
Well, I love the DMPS one I 've got...I even used it on my DMPS .308 yesterday am to break down the upper so I could send the barrel out for some work.

The clamshell type will not work on DPMS or RRA uppers that have raised rails. If you think you'll *never* need to do work on these, go ahead and get the clamshell. My thought is, if the white delrin works on EVERYTHING, why limit yourself with the clamshell type?

I had the clamshell one, but sold it after the first time I used the DPMS...I couldnt' see any reason to keep it.

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