- Drop in assembly
- Low reciprocating mass
- Adjustable recoil spring preload with included spacers
- Steel BCG recommended
- Adjustable gas system required
- Spring NOT INCLUDED
- Both pieces (including spacers) - 2.5oz
- Reciprocating piece - 1oz
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- Drop in assembly
- Low reciprocating mass
- Steel BCG recommended
- Adjustable gas system required
- Both pieces - 2.2oz
- Reciprocating piece - 1.1oz