If someone finds a better image, post it up.
http://www.tacticalinc.com/am15-upper-r ... p-420.html
The AM15 full auto UPPER RECEIVER allows you to shoot unmodified .22LR American 180 drums, in either 165 round, 220 round or 275 round capacity on YOUR M16 host receiver. The full auto AM15 upper receiver conversion is a BATF APPROVED OPEN BOLT drum fed .22LR rimfire caliber conversion that ejects through the AR mag well. It uses Colt Light Machine Gun style open bolt fire control parts, which are included with the AM15 conversion. The AM15 conversion will only work on registered receiver sear drilled M16 lowers. It WILL NOT work with drop-in auto sears or with lightning links.
THIS CONVERSION WILL NOT WORK ON ANY SEMI AUTO AR15. M16 ONLY
The AM15 Upper Receiver has a flattop style top cover that works well with an Eotech or comparable optic sight (which are not included with the AM15 Upper Receiver Conversion). The AM15 Upper Receiver comes standard with a billet machined quad mount ventilated barrel rail system which will allow the user to install any optional AR accessories of their choice on either of the 4 different mounting rails. The full auto 9.5 inch barrel is threaded 1/2x28-.400 and will accept AR flashhiders or full auto rated suppressors.
The complete AM15 Upper Receiver assembly, open bolt fire control parts, recoil buffer assembly, along with one 165 rd drum with stainless steel baseplate installed, winder and barrel with quadrail and no sights is $1789 plus shipping.