Happy with your Prusa printer? Earn $30 when you recommend us to your friend, family or shop with the updated Prusa Rewards Program. PS: They will get an extra Prusament spool!

Little Rocket Barrel Adapter v1.0 for 16mm or similar OD Barrels

A coupler designed to attach Little Rocket Barrels (or my LR PCAR) to 16mm or similar OD exposed metal barrels.
0
2
0
13
updated February 23, 2026

Description

PDF

This Little Rocket Adapter is a coupler designed to attach Little Rocket Barrels (or my Little Rocket PCAR) to 16mm or similar OD exposed metal barrels. In combination with my Little Rocket PCAR, this allows you to leave your Little Rocket adapter on any springer blaster without sacrificing accuracy and still be able to hot-swap to different ammo types when you want.

After several proofs of concept and a few tests, I finally have a functioning LR collet design to pair with the LR barrel Lug. As yet unprinted, but I'm confident this is as low-profile and functional as I could make a LR barrel adapter for hobby blasters.

FEATURES:
• Little Rocket Adapter for 16mm OD barrels
• Designed for Little Rocket Barrels + PCAR
• Increases blaster accuracy
• Quickly swap out with LR barrels or rifling of any type!
• Compatible with many short dart springers with exposed metal barrels
Not compatible with springers without exposed barrels

FILES INCLUDED: 
• 1 Little Rocket Barrel Adapter
• 1 Little Rocket Collet Nut

RECOMMENDED PRINT SETTINGS:
• Quality: No scarf seams or joints
• Strength: At least 3 wall loops
• Others: optional inner and outer brims to help with bed adhesion

HARDWARE NEEDED:
• 1 16mm ID x CS 2.5mm O-ring
• 1 14mm ID x CS 2.4mm O-Ring

LINKS:
Little Rocket PCAR
• Pro-Max Little Rocket Barrel Adapter
Little Rocket Family Platform

Tags



Model origin

The author remixed this model.

Differences of the remix compared to the original

A couple of two LR barrel lugs, with one side scaled up to attach to a 16mm or similar OD exposed metal barrel.

License