"Link to product: http://www.brillarmory.com/index.php?...
1. Reduction of wall thickness - it can be used in all M4 guns without problems.
2. Reduction of plugs for cylinder head -- Cylinder heads from all makers can be used.
3. Window for AoE
4. Window for checking the piston position.
5. Removal of radiuses around trigger contact areas - ASCU contacts can now be used without problems.
6. Gearbox can be..."
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Nice review of what you get in the Retro ARMS V2 box...and plenty of closeups by BRILL AIRSOFT so you can see it all! LIKE/SHARE and SUBSCRIBE to help this channel grow, they deserve your support!