First stripped the barrel down for a thorough cleaning.
Please note, not a real M-203, that would be illegal!
This is a M-203 replica smooth bore flare launcher.
The first session I ended up with this:
A little more work:
Some precision cutting with a less then precision Jet bandsaw
A rough fitting:
A little fine tuning, cut the groove for the gas port:
The quick release pin block:
Mean looking front end: