For anyone who enjoys working on their AR-15s without marring the finish, the Midwest Industries Lower Receiver Block is a great tool to have.
Handling an AR-15 lowerโwhile also assembling it, tightening something or just making it behaveโcan be a hassle. Midwest Industries (MI) has a solution, and their lower receiver block serves you in two ways.
First, you can simply slap the block down on your workbench and fit the receiver into it, nestled in place. Itโll stay put while you install the hammer and trigger pins and the trigger guard, even making it stay put while you hand-screw the buffer tube in place. (Youโll need more than the MI block to do the torquing and staking.)
While youโre doing this, the smaller section of the MI block has a recessed tray, where you can put the small parts youโll need. No worries about them rolling off the bench or getting bumped by an inadvertent sleeve or put-down screwdriver. Nope, theyโre safe in the recess.
If you want to view the interior as you install the fire control parts, you can. Simply take the block and slide the narrower part up into the magazine well. Yes, itโs shaped like a magazine for a reason. Now, clamp the bigger part of the MI block in your vise. You can now work on the lower, install and inspect as they function, or the fire control parts, without having to juggle the receiver in one hand while working with the other.
Being bright blue, it wonโt glare in your shop lights, but it also wonโt let parts hide, as a black or dark material might. Also, as a relatively soft polymer, it wonโt ding your lower or mar the finish. I know some of you want to keep your build as pristine as possible. (Some of us use our rifles.)
As if all this wasnโt enough, MI added one more function: a gas block gas tube installation recess. The hard part of getting a gas system assembled can be getting the blasted tiny roll pin driven into the gas block, with the gas tube in place.
I dare you to find a non-marring position in your bench vise to clamp the block in, with an orientation of the gas block that allows you to drive the pin in. Iโve been wrestling with AR-15s for 35 years now, and thatโs the part I hate the most.
The block is designed to work with forged receivers, so if you have a milled one, it might not be as nice a fit as MI intended it to be. They offer it in AR-15 and AR-10 sizes in one color: blue. Now, Iโve been wrestling with AR-15s for so long that I have some bad habits. Iโve found workarounds to get things done โฆ doing them without fixtures. But Iโm going to have to add this to the AR-15 toolbox, because itโs so useful for the things it does that it earned space in the kit.
Forty bucks may seem like a bit much for โa simple piece of plastic,โ as one person I showed it to commented, but donโt be fooled: Not 5 minutes later he was asking to borrow it.
Editor's Note: This article originally appeared in the March 2022 issue of Gun Digest the Magazine.
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