Geissele Automatics Magazine Well Reaction Block

The Geissele Magazine Well Reaction Block is a vise block that secures AR-15 and AR-10 lower receivers by sliding into the magazine well and clamping to a bench vise. It provides a stable platform for assembly and maintenance tasks such as buffer tube installation and starting M-LOK fasteners. The block is machined from 6061-T6 aluminum and includes integrated slots for fastener starts plus multiple orientation positions for access from the top or bottom. It is manufactured and finished by Geissele Automatics in North Wales, Pennsylvania, USA.

Features:

• Slides into the magazine well and clamps to a bench vise
• Fits AR-15 and AR-10 lower receivers
• Machined from 6061-T6 aluminum
• Integrated slots for starting M-LOK fasteners
• Multiple orientation positions for 90° indexing and access
• Allows top- or bottom-side work while holding the lower securely
• Frees both hands for assembly and maintenance tasks