One of the new AEGs from WE Airsoft is now in stock at RSOV.com... "SR-16 is the full-auto transform of the SR-15 rifle designed based on the M4A1 Carbine. It has the similar look of the M4A1 Carbine but equipped with a fixed stock found on the M16 rifle. WE SR-16 AEG comes with the same function as their M4 AEG: When turned to 'Safe', it will release the spring in the gear box back to normal state."