I have a like new ARMS SIR #51 that I am selling pictured below. It is a slim line civilian version, which I believe is the only way this model was produced. I have the original box and installation direction. Unit sells new for $369.00. As an added bonus, I have a Tango Down fore grip that I shaped to fit this unit before ARMS produced the replacement bottom rails. Since it will only fit on this rail, I will include it with the SIR. These retail for $62.00 new. I am asking $300.00 shipped
for the complete package. Looking for cash, not really interested in trades at this time. Thanks for looking.