Suspect Colt SP1 question > AR Discussions

Posted: 3/24/2010 2:41:21 PM EDT

I had a gentleman come into the shop i work in wanting to have a YHM Rail system installed on his rifle.

OK

While i am installing the rail, he puts another AR on the counter. He says he has just purchased it from "some guy"
who "seemed to be in a hurry". He wants me to take a look at it and see what i thought

OK

Its an OLD slab side colt AR-15 sp1.
Ser# 175xxx
Unstaked, Full Auto BCG
Low shelf, no sear hole

First thing i notice when I charged the rifle to make sure it was clear and then flipped the gun to safety, the safety lever moves to all three positions.
Immediately something tells me something isnt right here. I open the gun up, second thing i notice is that it has a 3 position selector, and a hammer whose tail is notched like ive never seen before.
The Trigger is stamped with a "C". The disconnecter is stamped with "CMP"

From the cocked position, on fire, the hammer will not fall at all when the trigger is pulled; it stays held by the disconnector. When the trigger is pulled and held, the hammer would drop when switched from fire to safe, or from safe to the "third" position. When in the "third position" the hammer would fall when the trigger was pulled, and would follow the BCG home when held down.

I'm not really sure what to make of it. I took pictures of the FCG, I will post them when i pull them off my blackberry here momentarily.

When i showed the customer and voiced my concern, i recommended he replace the FCG with another known "non third position" FCG IMMEDIATELY, and he agreed.

What do you guys think? I honestly don't know what to think

What do you guys think?

**Pics**
I know they are shitty. But they were taken close up with a blackberry camera

Posted: 3/24/2010 2:54:03 PM EDT

[#1]

Sounds like someone bought a F/A FCG off gunbroker/gun show thinking it would make their gun shoot full auto. Pull the FCG, replace with normal semi parts, tell customer to sell F/A parts on gunbroker or otherwise get rid of them. Easy enough.

Posted: 3/24/2010 3:31:18 PM EDT

[#2]

You know those proverbial "ten foot poles" you sometimes hear mentioned?

I would tell the customer you are not touching that gun with one.

Or with anything else, either.

Posted: 3/24/2010 4:32:11 PM EDT

[#3]

Some of the original Colt AR-15's were full auto. Not released to the public but were for military testing. He could have one of those I have seen them before. He could be in possession of a stolen class III NFA weapon. He is in one of those situation where doing the right thing might get him in trouble with the law or put him out some money. If he reports it depending on how the ATF wants to treat it they could screw him over and get him for possession of a machine gun. They could confiscate it if it is stolen. He is in just a bad situation IMO.

He could notify the ATF anonymously and have them run the serial and see if it is stolen. If it is not then just swap parts and make it legal but not telling the ATF it is currently a machine gun. If it is stolen he is just screwed and needs to get rid of it.

ETA use a pay phone, wipe prints, and make sure no cameras around.

Posted: 3/24/2010 5:15:20 PM EDT

[#4]

Quoted:
Some of the original Colt AR-15's were full auto. Not released to the public but were for military testing.

OP says that there was no sear hole.

Posted: 3/24/2010 5:19:36 PM EDT

[#5]

Quoted:
Sounds like someone bought a F/A FCG off gunbroker/gun show thinking it would make their gun shoot full auto. Pull the FCG, replace with normal semi parts, tell customer to sell F/A parts on gunbroker or otherwise get rid of them. Easy enough.

Bingo

Posted: 3/24/2010 5:30:06 PM EDT

[#6]

Could be that the original owner used with an RDIAS as well.

Posted: 3/24/2010 5:43:40 PM EDT

[#7]

Quoted:

Quoted:
Some of the original Colt AR-15's were full auto. Not released to the public but were for military testing.

OP says that there was no sear hole.

Missed that sorry

Posted: 3/24/2010 6:37:59 PM EDT

[#8]

The lower had no sear hole, and as far as i could tell never did.

I pray I did the right thing here.

I swapped out the trigger, hammer, trigger spring, hammer spring, both pins, safety lever, detent and spring with spare rock river parts i had on hand.
Checked it for semi automatic function. Pass.
I gave the guy back his gun. I explained the situation to him, and the potential consequences he could have faced. And he seemed truly thankful.

He never asked for the parts back. Theres a local class 3 dealer who frequents the shop. I gave the parts to him, maybe he can put them to good use.

Oh and by the way. The other upper I installed the YHM rail on. Blackthorne

I removed the barrel nut by hand. The barrel was unmarked, and the pins in the FSB literally almost fell out.
The castle nut was also hand tight, and did not even have notches for a wrench.

Posted: 3/24/2010 6:42:00 PM EDT

[#9]

Quoted:

You know those proverbial "ten foot poles" you sometimes hear mentioned?

I would tell the customer you are not touching that gun with one.

Or with anything else, either.

This. It could be a trap. And I'm not a tinfoil type. Run, don't walk away from that.

Posted: 3/24/2010 7:06:14 PM EDT

[#10]

Can the safety and open rear trigger and replace those with semi only parts,grind off the hammer tail and disconector tail and those 2 parts are GTG.

Posted: 3/24/2010 9:34:42 PM EDT

[#11]

Oddly enough, a buddy ended up with an SP-1 that had the same full auto parts, w/o the autosear nor a hole to mount one.
I advised him to replace the full auto parts, even tho' one pull of the trigger resulted in only one 'bang'.
People do goofy shit to ARs because changing out readily available parts is really easy.
Without an autosear, the gun really isn't a hanging offense. Does one pull = one bang?
Don't like the fact that the gun didn't pass safety check.
Moon

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