Phase 5 // Rifle Mini Stock Assembly (RMSA)

Rifle Mini Stock Assembly (RMSA)

***If you are interested in a different color Universal Mini Stock, please add the products separately in your cart to receive the same RMSA special price. Please add a HexOne-R to your cart and a Universal Mini Stock (your choice of color).   Product links below:

Hex One Rifle Length

Universal Mini Stock


Product Description:

The Rifle Length Mini Stock Assembly (RMSA) is a combo kit featuring our Universal Mini Stock (UMS) mounted on our rifle length HexOne buffer tube for an excellent rifle fixed stock solution. The UMS is also compatible with a number of other buffer tubes, including Mil-spec carbine receiver extensions and most round tubes, it was designed to complement the sturdy HexOne buffer tube.

The UMS and HexOne are precision machined in house from USA sourced raw billet aluminum. The HexOne buffer tube is cut from 7075-T7 and the UMS is 6061-T6. The HexOne buffer tube features a hexagonal design that is much thicker and rugged than a mil-spec receiver extension tube making it perfect for any of your rifle length AR platform systems.

The UMS offers a smaller footprint and bottom curve which makes for a far superior anchor of the stock on the chest.  This allows an operator to get in and out of postion with greater of ease.

The HexOne and UMS undergo a rugged tumbling process that further strengthens the exterior of the parts while leaving the surfaces smooth and snag free.


  • Length: Extends 9.9" behind lower receiver
  • Weight: 14.2oz (UMS and HexOne Buffer Tube)
  • Material: UMS: 6061-T6 HexOne: 7075-T7


  • (1)Universal Mini Stock
  • (2)Set Screws (installed)
  • (1)Extended 1/8" hex key
  • (1)HexOne Rifle Length Buffer Tube
  • (1)AR-15/M16 Rifle Buffer
  • (1)AR-15/M16 Rifle Buffer Spring
  • (1)Castle Nut
  • (1)End Plate

 Prop 65 Warning 

Item Price: $129.99
Overall Length:
10.5 Inches
Product Weight:
Assembled Weight:
Made in the U.S.A.

Heavy duty fixed mini stock assembly.


Proudly made in the U.S., from U.S. sourced raw billet aluminum, on U.S. manufactured machines.


Rifle length buffer tube that accepts any end plate sling mount