Airsoft AR-57 Upper Receiver for ICS Lowers Platform

This is my take on the AR-57 for airsoft. The Echo 1 version is hard to find in my area and I really wanted to get one, so I decided to make one for my ICS. This will work with base ICS lower Receivers along with the CXP Receiver. The handguard offers an M-LOK compatible rail system.

This project requires zero modifications to the gearbox or lower receiver so you can swap back to your standard upper at any time.

This will not work with ICS upper gearbox with EBB (electric blow back). The EBB unit is too tall. You will need to get a separate upper gearbox without the EBB.

Parts needed (you do not need these specific screw/heat insert kits. but you need the specific spring)

Parts Count needed Purchase Link

M3 Heat insert 5 https://www.amazon.com/gp/product/B09TNK8GD6/ref=ppx_yo_dt_b_search_asin_title?ie=UTF8&psc=1

M4 Heat Insert 5 https://www.amazon.com/gp/product/B0CX8VQYWM/ref=ppx_yo_dt_b_search_asin_title?ie=UTF8&psc=1

M3 x 25 Hex Head Screw 3 https://www.amazon.com/gp/product/B0CQNN6NY3/ref=ppx_yo_dt_b_search_asin_title?ie=UTF8&psc=1

M3 X 6 Hex Head Screw 1 https://www.amazon.com/gp/product/B0CQNN6NY3/ref=ppx_yo_dt_b_search_asin_title?ie=UTF8&psc=1

M3 X 6 Countersunk Screw 2 https://www.amazon.com/gp/product/B0CMCDWWRZ/ref=ppx_yo_dt_b_search_asin_title?ie=UTF8&psc=1

M4 X 8MM 4 https://www.amazon.com/gp/product/B0CSX4LF6Y/ref=ppx_yo_dt_b_search_asin_title?ie=UTF8&psc=1

M4 X 10MM 2 https://www.amazon.com/gp/product/B0CSX4LF6Y/ref=ppx_yo_dt_b_search_asin_title?ie=UTF8&psc=1

0.8 x 9mm x 35mm Compression Spring 1 https://www.amazon.com/gp/product/B0B6J19Q14/ref=ppx_yo_dt_b_search_asin_title?ie=UTF8&th=1

P90 Hopup 1 https://www.evike.com/products/30704/

250~ Inner Barrel 1 https://www.evike.com/products/84036/

Where is each screw used? The 3 M3x25 is for the top rail on the upper Receiver The 1 M3X6 hex head is for the hopup retention The 2 M3X6 countersunk is for the front rail at the front of the handguard The 4 M4X8 is used to hold the handguard onto the upper receiver The 2 M4X10 is used to attach the outer barrel to the handguard/upper receiver all heat inserts are pointed out in the video below

Video link for assembly:

Grip used for picture: https://www.thingiverse.com/thing:5526005

Edit: 9/20/24 Added a variant to the barrel called flat barrel. this can be printed laying flat on the bed so the layer lines are in a stronger orientation. This will help prevent any barrel attachments from breaking off. This part only needs support near the threads and maybe near the screw hole mounts. it does not need support in the barrel itself