Bolter Conversion for M4 Airsoft

Bolter conversion for m4 Airsoft gun
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UPDATES: Aug 2017
Fixes: July 2017 !
2 parts have been updated:
Boltergrip3.stl and BolterOuterBarrel4.stl
This now allows the handguard to lock in the outerbarrel :)
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The donor used for this was a G&G Raider Polymer bodied airsoft M4.

The inner barrel, front iron sight, metal reinforcing bar and bushing from inside the rail system were disposed of