Gunsmithing need some help here

[BrettSass844]

A guy at work was cleaning out his dad's stuff and stumbled upon this. He does not mess around with guns at all so he brought it in and told me I could have it. It has a 3 position safety. S, F, and a position with no engraving. No # anywhere on it. There is 2 places where there is a B engraved. Obviously resembles a AR receiver but not exactly. Any info is appreciated.

 

[oneshot onekill]

Re: need some help here

Looks like it might have some Full-Auto capability and technically, a receiver constitutes a firearm if BATF wants it to. Get some other opinions if you like but I would destroy it immediately. You may want to remove the pictures from here too.

Maybe I'm over-reacting but I wouldn't want my ability to EVER own a firearm again taken away because I couldn't ID something! FWIW

 

[kmussack]

Re: need some help here

That's one of the very early Bushmaster lowers.
Not Full-Auto is my bet.

Actually a Gwinn Firearms "Bushmaster" rifle.

 

[oneshot onekill]

Re: need some help here

<div class="ubbcode-block"><div class="ubbcode-header">Originally Posted By: kmussack</div><div class="ubbcode-body">That's one of the very early Bushmaster lowers.
Not Full-Auto is my bet. </div></div>
You're probably right but that piece in the back of the trigger group that is in the extra cut-out on the receiver looks like it could be some sort of Full-Auto sear.

 

[kmussack]

Re: need some help here

And the hammer has the dreaded "hook" on it......

 

[oneshot onekill]

Re: need some help here

Found this on another site:

"It was sold under the name "Assault Rifle" which confused a lot of people. I have also heard that many had a selector for full-auto fire (even though it was uncapable of fullauto). The Gwinn Arms Company of Winston-Salem, North Carolina, were in business from 1972 -1974 before Gwinn went bankrupt, and Quality Parts (reformed as Bushmaster ) bought them out. Mark Gwinn was the inventor of the original bushmaster rifle. Later Mack W. Gwinn JR Started the MGI - Mack Gwinn Industries (Modern manufacturer of quick change barrel system and other components for the AR-15)."

 

[Guest]

Re: need some help here

From those photos it looks to me all your missing is the sear. "Most" will not run F/A w/o the sear, as the hammer will follow the bolt, and depending the carrier it may just lock up.

If you know for a fact there's NFA paper on it your good, if not Club Fed is awaiting you.

 

[BrettSass844]

Re: need some help here

I had a feeling about the full auto. But I'm not 100% sure. Forgive this question but I'm not familiar with ARs that much. How can I tell. When I turn the safety to the un engraved spot it definitely has moving components down in the receiver. Almost like it is rotating the piece out of the way. If its not a full auto and is one of the original Bushmasters what is the value or demand for something like that to a collector?

 

[Kells81]

Re: need some help here

Disconector does not look like it has a tail. The FCG looks almost pure AR drive the pins out and take a pic of the fire control group. The hammer having a hook does not mean anything but if your disco has a tail then there might be an issue.

** added pics of FA FCG

 

[Kells81]

Re: need some help here

Found this on ARFCOM,

It appears that the upper reciever is the serialized part so even if what you have is a FA lower its no diff then getting a FA lower with a FAL kit.

http://www.ar15.com/forums/topic.html?b=7&f=93&t=803512

 

[BrettSass844]

Re: need some help here

<div class="ubbcode-block"><div class="ubbcode-header">Originally Posted By: kmussack</div><div class="ubbcode-body">That's one of the very early Bushmaster lowers.
Not Full-Auto is my bet.

Actually a Gwinn Firearms "Bushmaster" rifle. </div></div>

I am 99% sure its this model and not a full auto. What is the value, demand, and how common are these. I found some info on the pistol models manufactured during the same time period and they are selling for 1000 to 1600 (complete firearm). Hopefully its got some value to it and I can take it to a show and ditch it to stock up on some reloading components!