A&S Conversions
UZI Talk Life Member
That is exactly why I sold my first machine gun, Colt M16 roll marked RR. It was a great gun, but I didn’t like the limitation of the magwell. So after I found a DIAS, I sold the Colt gun. As with “amphibian” I use it with the MGI modular magwell lower. There are just so many calibers and configurations that can be used when the magwell doesn’t have a serial number and can be modified. I have several of the standard AR, one of which I had made into a modified Thompson (think modified Uzi mags for the Colt 9mm system) for my DI .45 upper. Another one has a drop in 9mm magwell adapter. I have several of the 7.62X39 but no 5.45X39, large frame Glock (.45 & 10mm), and a Grease Gun magwell for the CMMG .45 rotary delayed blowback upper. If things work out, I would like to have a MP5 and a MP5-40/10 magwells made. I have a 10mm DI upper but I would rather use the HK mags than the Glock mags with the Kris’s Vector extensions.
It is my understanding that there are only 100 transferrable Colt 9mm lowers in the registry. Certainly using a ramped bolt is a good idea, but with my drop in and the two Colt 9mm lowers I have (it was very difficult to find front push pin lowers), I found that the trip surface of the full auto hammer would pound on the top of the disconnector. In looking through threads about trigger slap there were some pictures of a full auto set of fire control where the hammer trip surface was split down the center and the top of the disconnector was pointed to fit into the groove made in the hammer trip surface. There was also a modification of the trigger to give the split trip surface room to go lower into the trigger without pounding it.
I searched for them but they were long since out of stock. Besides one lower is a pre’94 but after the switch to the 0.250 front pin. The other lower is an early LEO lower before the color change and the machined sear block. Since the LEO carbine was going to Law Enforcement, the sear area had no block. But both lowers have the 0.169” fire control pins instead of the standard 0.154” pins of the M16. I had M60Joe ream the fire control holes in some full auto hammers and disconnectors so I could use my drop in with the Colt lowers. I did have to modify the triggers so that the disconnectors could stick out the back of the trigger.
Does the bolt that came with the DOE upper have a tungsten weight instead of the standard steel? My DOE clone works better with a tungsten weighted bolt.
Scott
It is my understanding that there are only 100 transferrable Colt 9mm lowers in the registry. Certainly using a ramped bolt is a good idea, but with my drop in and the two Colt 9mm lowers I have (it was very difficult to find front push pin lowers), I found that the trip surface of the full auto hammer would pound on the top of the disconnector. In looking through threads about trigger slap there were some pictures of a full auto set of fire control where the hammer trip surface was split down the center and the top of the disconnector was pointed to fit into the groove made in the hammer trip surface. There was also a modification of the trigger to give the split trip surface room to go lower into the trigger without pounding it.
I searched for them but they were long since out of stock. Besides one lower is a pre’94 but after the switch to the 0.250 front pin. The other lower is an early LEO lower before the color change and the machined sear block. Since the LEO carbine was going to Law Enforcement, the sear area had no block. But both lowers have the 0.169” fire control pins instead of the standard 0.154” pins of the M16. I had M60Joe ream the fire control holes in some full auto hammers and disconnectors so I could use my drop in with the Colt lowers. I did have to modify the triggers so that the disconnectors could stick out the back of the trigger.
Does the bolt that came with the DOE upper have a tungsten weight instead of the standard steel? My DOE clone works better with a tungsten weighted bolt.
Scott
