View Full Version : What upper receiver holding block?
Is the dpms claw or the clam shell type preferred?
My take:
1. I haven't used my clam shell-style in years.
2. The DPMS upper block ("claw") is better for most applications. Be prepared to modify it slightly if you use Vltor MUR uppers. I use this for mounting scopes, sights, and similar non-torquing activities.
3. For almost all uses involving torquing something attached to the upper (e.g., barrel nuts, muzzle devices) I use a Geissele Reaction Rod (best alternative).
titsonritz
07-21-18, 15:54
My take:
1. I haven't used my clam shell-style in years.
2. The DPMS upper block ("claw") is better for most applications. Be prepared to modify it slightly if you use Vltor MUR uppers. I use this for mounting scopes, sights, and similar non-torquing activities.
3. For almost all uses involving torquing something attached to the upper (e.g., barrel nuts, muzzle devices) I use a Geissele Reaction Rod (best alternative).
Same here.
elephantrider
07-21-18, 16:38
The DPMS claw works, but you need to rotate the upper 90 degrees, so that the vise is clamping through the vertical axis of the upper
On a budget? This works perfectly fine:
https://www.plastixrevolution.net/collections/ar15-upper-vise-blocks/products/ar-15-basic-upper-receiver-vise-block
Want the nicer tool, that is a little faster, more convenient to use? This:
https://geissele.com/ar15-m4-reaction-rod.html
titsonritz
07-21-18, 17:20
I go with a Magpul Bev Block is budget was the main concern as it will handle both the upper and lower.
The DPMS claw works, but you need to rotate the upper 90 degrees, so that the vise is clamping through the vertical axis of the upper
On a budget? This works perfectly fine:
https://www.plastixrevolution.net/collections/ar15-upper-vise-blocks/products/ar-15-basic-upper-receiver-vise-block
Want the nicer tool, that is a little faster, more convenient to use? This:
https://geissele.com/ar15-m4-reaction-rod.html
I have to admit that using the DPMS claw rotated like that never occurred to me. Then again, I still fool around with old A2 uppers with integral carry handles (at least sometimes), and that would not work well.
Even with care and a block of soft wood to cover the Pic-rail on the "top" of a flattop upper, I would be a little trepidatious with that setup. Could be done though.
Magpul bev block
^^ This ^^
I use the PRI.
I have literally built thousands of uppers on this.
https://www.precisionreflex.com/Detail.aspx?PROD=186711
I use the PRI.
I have literally built thousands of uppers on this.
https://www.precisionreflex.com/Detail.aspx?PROD=186711
Does that little thumbscrew deal hold the rail tight wnough to do any work?
This is what I use, plain-jane. No doubt made from scraps by high school kids:
https://www.squirreldaddy.com/PRO-AR-Upper-FF-Lower-Vise-Block-Pin-Pusher-p/sd20-131.htm
The total arsenal:
https://www.botach.com/kley-zion-barrel-spline-socket-rod-for-ar15-m4-ar10-sr25-upper-receivers/
https://www.botach.com/kley-zion-ar15-m4-receiver-extension-buffer-tube-bock/
I know, they are clones, but I wouldn't have bought the buffer tube block in particular at the orignal's price of $100.00.
To be honest, my PRI block is older and does not have that thumb screw thingy. I have some other device for that application. I replaced the pin with stronger ones. The safety pins on the Tomahawk Missiles make for wonderful upper vice block pins!
The OP already knows about this tool from his thread on TOS, but I'll just link it here too. > https://www.2uniquellc.com/product-page/m16-barreling-spud
Based on the tool from this thread. > https://www.ar15.com/forums/Industry/Windham-Weaponry-upper-assembly-jig-2UniqueLLC-jig-now-available-/489-254215/
Just to show that there is nothing new under the sun, the previous tools have no connection to this antique military armorer's tool to my knowledge, but they accomplish the same thing. > https://www.ar15.com/forums/AR-15/Anybody-ever-seen-one-of-these-AR-Jig-/118-721634/?page=1
The OP already knows about this tool from his thread on TOS, but I'll just link it here too. > https://www.2uniquellc.com/product-page/m16-barreling-spud
Based on the tool from this thread. > https://www.ar15.com/forums/Industry/Windham-Weaponry-upper-assembly-jig-2UniqueLLC-jig-now-available-/489-254215/
Just to show that there is nothing new under the sun, the previous tools have no connection to this antique military armorer's tool to my knowledge, but they accomplish the same thing. > https://www.ar15.com/forums/AR-15/Anybody-ever-seen-one-of-these-AR-Jig-/118-721634/?page=1Wow. Their tools look beefy AF. Pricey, but they look like they're worth it.
Sent from my SM-G935V using Tapatalk
Wow. Their tools look beefy AF. Pricey, but they look like they're worth it.
Sent from my SM-G935V using Tapatalk
They are very nice, I kind of want to get another set just because.
I have done several hundreds and possibly as many as a thousand with the Reaction Rod. It's hands down the most versatile tool for all around upper receiver work.
I have done several hundreds and possibly as many as a thousand with the Reaction Rod. It's hands down the most versatile tool for all around upper receiver work.This. Hands-down works every time, fast and easy.
I haven't bought a tool for this yet, but after taking Iraqgunz' class, I'll definitely be buying a reaction rod, and the reaction block to hold the lower.
FromMyColdDeadHand
01-29-19, 15:51
What is the difference between the Guyslee Reaction rod and super reaction rod? Done a bunch of lowers, but looking at getting into uppers, since I never find exactly what I want, with all the options out there.
What is the difference between the Guyslee Reaction rod and super reaction rod? Done a bunch of lowers, but looking at getting into uppers, since I never find exactly what I want, with all the options out there.
https://geissele.com/ar15-m4-super-reaction-rod.html
https://geissele.com/ar15-m4-reaction-rod.html
Marler5811
01-30-19, 09:48
Geissele Reaction Rod. All. Day. Long. I've used pretty much everything under the sun, and it's hands down the best tool for the job.
What is the difference between the Guyslee Reaction rod and super reaction rod? Done a bunch of lowers, but looking at getting into uppers, since I never find exactly what I want, with all the options out there.
If I had to choose between the two I would get the Midwest Industries URR.
The Geissele brass wedge system is a pain to set up correctly, and the two screws that hold the brass wedges in place don't last long. Once the hex slots in the screws round out all you have is a standard Reaction Rod, which leaves you open to the not rare enough possibility of shearing the indexing pin and damaging the indexing pin slot on the upper receiver.
The MI URR is as quick and easy to use as the standard Reaction Rod, and at the same time supports the upper better than the Super Reaction Rod.
So again, go with either the MI Upper Receiver Rod, 2UniqueLLC barreling jig or the Windham Weaponry barreling jig.
For the Price the MI URR is the way to go.
MorphCross
01-30-19, 20:01
Bev block is a good "budget" tool for an infrequent builder or modifier. It works for both the upper and lower assembly. If you are going to be doing a large quantity get the Midwest at a minimum; Geissele SRR and Reaction Block at the maximum.
As always either metal or wood barrel blocks padded with leather and rosin for anti-slip to install muzzle devices if torquing is recommended by the manufacturer.
Bev block is a good "budget" tool for an infrequent builder or modifier. It works for both the upper and lower assembly. If you are going to be doing a large quantity get the Midwest at a minimum; Geissele SRR and Reaction Block at the maximum.
As always either metal or wood barrel blocks padded with leather and rosin for anti-slip to install muzzle devices if torquing is recommended by the manufacturer.
I mostly agree with you, but how is the Geissele SRR superior to the MI URR? I would argue that if you were going to be doing a maximum amount of builds that it would be wise to use either the MI URR, or better yet the 2Unique jig or even better still the Windham Weaponry Jig.
I have all of these tools and the Geissele Reaction Rod isn't better in any way.
MorphCross
01-31-19, 00:04
Don't misunderstand, the URR is a phenomenal tool for those doing a huge number of builds but having used the SRR as well I like the index off the ejection port opening. Different strokes and all.
FromMyColdDeadHand
02-05-19, 19:01
I got the MI-URR. Why is there a hole in the front and back face of it? The barrel extension mating end seems to have something in the hole.
Thanks
I got the MI-URR. Why is there a hole in the front and back face of it? The barrel extension mating end seems to have something in the hole.
Thanks
It's probably just metal shavings/grease. I figured that those little holes were mounting points from when it was in the lathe.
Powered by vBulletin® Version 4.2.5 Copyright © 2024 vBulletin Solutions, Inc. All rights reserved.