NcSTAR VISM AR-10 Upper Receiver Block

Manufactured by NcSTAR
Manufactured by NcSTAR
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The NcSTAR VISM AR-10 Upper Receiver Block is designed to provide complete support to the upper receiver of an AR-10 rifle during barrel installation or removal, effectively preventing any damage caused by torque twisting forces.

This upper receiver block consists of two halves: the upper half is inserted into the AR10 receiver similar to a bolt carrier group, while the bottom half can be securely bolted together with the upper half using the provided steel bolts. This ensures full support for the inside and bottom of the AR10 receiver, while still allowing for the attachment of accessories and optics to the receiver optics rail.


  • Compatible with AR-10 upper receivers
  • Aluminum construction
  • Anodized blue finish
  • 8.4" x 3.1" x 2.0"
  • 29 oz. weight

Furthermore, the AR10 upper receiver block features a hole that runs through its entire length, acting as a guide for bore brush cleaning during barrel maintenance.

Constructed with blue anodized aluminum, this upper receiver block measures 8.4” in length, 3.1” in height, and 2.0” in depth. With a weight of 29.0 oz., it is a durable and lightweight accessory for AR-10 owners.

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California Prop 65 warning

 WARNING: This product can expose you to chemicals, which are known to the State of California to cause Cancer and Reproductive Harm. For more information go to

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