Congrats! I just did the forms for a supressor and am wanting to do the forms for both of my lowers so that I may go with a SBR. I got the bug for gas piston but I decided against it unless ht egun was designed for piston from the get go i.e. SCAR, ACR, etc. Gas piston conversions dont seem to be the way to go. Post pics when you get it.
Nov 2, 2011 sent form 4, SS Sparrow. Arrived May 29, 2012.
Jan 30, 2012 sent form 1 for SBR. Arrived July 12, 2012
Jan 22, 2013 Sent form 4, 762-SDN-6. Arrived Sept 13, 2013