pmcclain

Thanks, perhaps the best way to go about this is ask ATF like you said. I've gotten conflicting answers from Class III dealers. Perhaps it is my fault for not describing my paperwork in detail. The last dealer I spoke with who has been in the business many years and saw my Form 1, told me my lower is the registered part and if I ever broke the sear, I can replace or repair it. The drop-in sear was not made by me, I ordered it way back ago, back when you could. To me it looks well made, it is steel. I'll make a picture and attach it to this thread later this week. On the uppers, I'll have to keep searching for answers on what works and what doesn't. I'm not too far from Knob Creek Range and next month (Oct) is their next shoot. Its been a while since I have been there, so I think it would be fun to see all the toys, and perhaps get more information from that gathering of folks.

The letter with my Form 1 states I would install the drop in sear as one of the steps to convert it, so as much as I would like the idea of M16 sear with 3 shot burst, that ain't happening. Plus the letter says no modification will be made to the lower except the DIAS and the M-16 trigger parts. Lower receiver has been engraved properly with the required information. What I have been told is as long as I can easily but the gun back like it was (that's with a 20" in 223) - & I can by pushing out 2 pins and swapping an upper. So what do think this thing is worth? OH, and thanks for the replies! Still waiting on someone to let me know about select-fire with different caliber uppers and perhaps someone that can make a spare DIAS parts kit.

Hello friends - I have a Colt SP-1 AR-15 with s a steel drop-in auto sear. I built it in the early 80's on a form 1. The lower receiver is registered not the drop in sear. I think I paid less than $700 for the new gun and less than $75 for the sear and other parts. Back then for me, that was a ton of money. I've taken it out a handful of times and shot it. It runs great. Recently I've gotten more interested in shooting and reloading so it has had more rounds put thru it in the past year then the previous 35. I 'd like to buy a spare drop-in auto sear for parts. I have no access or knowledge to making one myself and I hope I never need any parts, mine looks just fine. But these things seem to be very rare. So do any of you know of a person that can make these? I sure would like to talk to them and have no problem with sending them my paperwork to show I'm legit and not trying to do something illegal. Another dumb question, will other of the many caliber uppers function as select-fire on my registered lower? The bolt carrier's on the various uppers will they match-up with my sear? One of the modifications I had to do on my AR-15 as you all know, was change the bolt carrier to a M-16 type. We all have said it many times....If I only knew back then what was going to happen with these things we would be very wealthy people. I just recently learned a M11 that I paid $400 for is now worth $8K!