AR -15 Lower Receiver weirdness...Judge Colt?
I am looking at a Colt AR15 SP1 Carbine. It appears to be excellant in every way. Black locktite on the stock, proper markings and configurations for a real gun.
The problem. It looks to me like the area on the left front of the lower receiver, where the Colt logo and serial numbers are located, was machined differently than the rest of the reciever. It's hard to tell by the picture, but if you look closely I believe you will see what I mean. It looks to me like it was ground down, then stamped with logo etc, and parkerized.
I've looked at a lot of AR15's and can't remember ever seeing such a thing.
Does anyone know if this is something the factory did from time to time for what ever reason, or is this a fraudulent gun...
Interesting...if it is a fraud it is the best/worst attempt you could hope for. It looks like the place in question was machined after the original machining, stamped, then parkerized for the first time. From the look of the rest of the gun it looks like a match parkerizing wise...
I'll call the factory tomorrow...
Whadda ya think Judge Colt?

Mateomasfeo
"I am what I am!" - Popeye
The problem. It looks to me like the area on the left front of the lower receiver, where the Colt logo and serial numbers are located, was machined differently than the rest of the reciever. It's hard to tell by the picture, but if you look closely I believe you will see what I mean. It looks to me like it was ground down, then stamped with logo etc, and parkerized.
I've looked at a lot of AR15's and can't remember ever seeing such a thing.
Does anyone know if this is something the factory did from time to time for what ever reason, or is this a fraudulent gun...
Interesting...if it is a fraud it is the best/worst attempt you could hope for. It looks like the place in question was machined after the original machining, stamped, then parkerized for the first time. From the look of the rest of the gun it looks like a match parkerizing wise...
I'll call the factory tomorrow...
Whadda ya think Judge Colt?

Mateomasfeo
"I am what I am!" - Popeye
0
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I have an SP1 that was made at about that same time, & it looks identical to yours. Even the upper looks slightly "grainier" than the lower, just like yours, & the serial # digits are slightly lower than the "SER SP1". Yes, they were parked after the markings were applied.
There were several changes in the stamped markings throughout production of the SP1. From what I see in the picture, yours looks righteous. I believe that the lowers were cast, not machined.
Neal0 -
Thanks Neal!
It looks like it was ground down before it was logo-stamped and after it was cast. Its not just grainey, I can see where something ground that area down. The metal looks thinner on that wall of the mag well when view from above looking down into the mag well...Perhaps it was a defect in the mold that was repaired by factory after casting...seems unlikely...would Colt do that?
Maybe I am just paranoid...
Mateomasfeo
"I am what I am!" - Popeye0 -
Woops! Here is a better angle... 
Mateomasfeo
"I am what I am!" - Popeye0 -
As Mr. Myers has stated, the rifle and markings appear normal for the time. The quality of the machining varied from rifle to rifle, and some show stray machining marks as does this one. Fine finish was not a requirement for military rifles.
All the references to the receiver being cast are incorrect. The Colt receivers are forged, not cast. Many of the cheap clones are cast, with those with raised lettering being the most obvious.0 -
Thanks Judge! I knew I could count on you.
For sale for 1225. Otherwise excellant condition. What do you think?
Mateomasfeo
"I am what I am!" - Popeye0
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