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Cross Machine Tool
Overview
The Cross Machine Tool J.a.g. Gas Block is designed for a .875" diameter gas system and features a set screw style for secure mounting. Constructed from steel and finished with nitride, this gas block ensures durability and reliable performance under varying conditions. This gas block is commonly found in builds aiming for a robust and straightforward gas system without the complexity of adjustability.
Availability is good for the Cross Machine Tool J.a.g. Gas Block - .875" - Set Screw Style: it was in stock at one retailer or another nearly every day in August 2026, and today the one retailer we track has it in stock. Prices barely moved in August 2026, holding around $29.45, so there haven't been real sales lately. Buying today, the lowest price is $29.45 at Primary Arms, which matches the best price we saw in August.
Prices checked · refreshed daily across 35 retailers
We ranked every gas block by how often it shows up in real builds on GunPartPicker.
Read the guide: AR-15 Gas Block Guide →Check it against the live catalog:
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