Feinstein Gewehr Werke, LLC, a Dallas-based plastic brick kit manufacturer, has a near monopoly on a very, very niche market. That is because the company is one of the few—possibly only—manufacturers that produce functioning AR-15 stocks out of plastic bricks.

“Our kits enable you, your child, or grandchild, to build an AR compatible gun stock you can mount on your AR, or any rifle or shotgun that takes a standard AR buffer tube,” the company stated on its website.

“Grayson, above, is modeling a completed and installed Mk 8 AR rifle stock. We’ll forgive him the trigger finger as there’s no bolt in the gun,” stated the website.

While the Mk 8 AR stock may not look very sturdy, its creators say the stock is meant to be used and have reinforced it with steel rods for stability. The plastic bricks are meant to be glued down and cemented to a buffer tube with epoxy.


“You will need several small tubes of super glue to glue the bricks and reinforcing metal threaded rods together and one .85 oz pack of 2-part epoxy to secure the stock to the buffer tube,” the company stated. “Both types of glues are available at your local hardware store. The Mk 8 has been tested to withstand the recoil from 12 ga 3″ 00 buck rounds: 24 shots. The Mk 8 configuration requires a mil-spec size buffer tube.”

From the pictures on the company’s website and the related Feinstein Project, there have been numerous other designs for a plastic brick stock before the designers finally settled for the current configuration. Feinstein Gewehr Werke’s lengthy instruction booklet stresses that while children may enjoy being part of the assembly, the glue and epoxy work should be done by an adult. This is partly for the safety of the child and also because the solidity of the stock depends on the precision of the glue placement. The last thing that many shooters need to be doing at a gun range is picking up little plastic bricks sprinkled on the floor.


The stock retails for about $40 before tax and shipping. A video of the stock being tested using 12 gauge rounds can be seen on Feinstein Gewehr Werke’s website.

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