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Purpose:
This insert fills the empty space inside an AR-15 buffer tube (receiver extension) when the buffer and buffer spring are removed.
Compatibility:
Works with Right To Bear .22LR uppers
Works with CMMG .22LR conversion bolts
May also fit BRN-180 and FM-15 self-contained uppers, but durability will be reduced due to heavier recoil compared to .22LR
Installation Notes:
The insert fits with the buffer retainer detent installed, but removing the detent makes installation and removal easier
Slide the insert into the buffer tube until fully seated
Printing Recommendations:
Use at least 15% infill with a concentric pattern
The design has two pieces; gluing them together makes handling easier, but this is optional and not required for function
LBRY Tags: ar15; fosscad; 3d2a; firearms; 3d printing
This insert fills the empty space inside an AR-15 buffer tube (receiver extension) when the buffer and buffer spring are removed.
Compatibility:
Works with Right To Bear .22LR uppers
Works with CMMG .22LR conversion bolts
May also fit BRN-180 and FM-15 self-contained uppers, but durability will be reduced due to heavier recoil compared to .22LR
Installation Notes:
The insert fits with the buffer retainer detent installed, but removing the detent makes installation and removal easier
Slide the insert into the buffer tube until fully seated
Printing Recommendations:
Use at least 15% infill with a concentric pattern
The design has two pieces; gluing them together makes handling easier, but this is optional and not required for function
LBRY Tags: ar15; fosscad; 3d2a; firearms; 3d printing
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