Larger Retractable Stock for Mosquito Airsoft with Parametric Files

Update 2025-09-11: Added adapters for the Mosquito MK1. You will need supports for the MK1 adapters. See screenshot for details.

Update 2025-06-10: Changed the tolerances for the latch cutouts since it was too tight for some users, added fillets to reduce the likelihood of the stock tube cracking, and added details to improve the print quality of screw holes.

Update 2024-12-15: Changed the tolerances of the latch positions. It should now have less wobble at max extension, and less play in general.

Miki's retractable stock is brilliant. It's roomy and looks fantastic on the Mosquito.

My only gripe is that the shoulder pad is too small for my liking, a couple of my friends also complain about it being too short.

This is my extended version.

This version offers a couple upgrades over Miki's original:

There are now strap loops on either side.

The cutout is larger to fit large MOSFET PCBs like the one that comes with G&G V3 ETUs. Yes, I will post a selector plate for G&G ETUs.

There are now many more positions for the stock.

You'll need FreeCAD 1.0 or newer for the included CAD file. Changing the two VarSet values allows you to tweak the length and shoulder pad size yourself.

This has the same tolerance as Miki's 0.1mm variant. If you need 0.15mm simply scale the stock.stp up in the X Y axis to 100.32%.

Parts are all fully compatible with Miki's Retractable Stock, though in my version, a 16mm countersunk screws works better for securing the latch/catch. 18mm is a little too long.

Unforunately, I can no longer link to Miki's stock in the “Model Origin” section due to a Hybrid Airsoft updating the License of the Mosquito Airsoft Kit to Creative Commons while Miki's model still being on GNU. I have linked Miki's model in the description.