Early transitional RPB M10 Carbine parts set

[MitchWerbellsGhost87]

This is a peculiar one. It is an RPB M10 SAC carbine… but it’s made from all leftover MAC M10LR SMG parts. Receiver is marked SAC for “semi auto carbine” so it did indeed leave the factory like this, and it has factory provisions for a collapsible stock as well. All of the other RPB carbines I’ve seen had the stock welded in place with no stock hardware installed. This is the only RPB semi auto frame I’ve ever seen that is set up for a collapsible wire stock from the factory. It also has a very early MAC trigger with the little nipple on the back of it. I believe this is the earliest example of an RPB M10 SAC carbine I’ve ever seen. Shame it was demilled like this, what a tragedy.

 

[LGustin]

That’s interesting for sure.

 

[timkel]

I like the checkering on the wood handguard.

 

[BlackBelt]

That is a really cool piece there.

 

[rchaisch]

Neat

 

[root]

That deserves a new upper so it can be ran.

Wish I could find one of those.

 

[skiboatsp]

obviously not the same animal but.....

 

[saxon]

so your the one who ended up with it

 

[MitchWerbellsGhost87]

UPDATE: well, a previous owner decided to use contact cement on the barrel threads like loctite as well as the end cap for the shroud. The handguard was glued on as well which is odd because this heat shield is designed to have the wood handguard attached, as it has no holes on the bottom, but it appears that the shroud has not been drilled/tapped and HG was never drilled, just glued. I was able to remove the handguard without issue, but it has proven impossible to remove the barrel from the remaining chunk of the upper. It doesn’t help that the shroud spins freely around the barrel. I have tried every possible means of unscrewing the barrel and I just can’t get this one off. I have never had this issue before with a MAC upper/barrel. This carbine shroud has a unique endcap with 2 holes that would require a spanner wrench like the suppressor encapsulators. I am probably going to attempt to cut the old upper off the barrel. Gonna have to cut through the trunnion without cutting into the threads. Now I see why the previous seller didn’t remove that piece of scrap upper prior to selling it.

 

[MitchWerbellsGhost87]

I like the checkering on the wood handguard.

The checkering looks like it was done by hand.

 

[MitchWerbellsGhost87]

Another update. This is the 10th RPB carbine made. a buddy of mine has the old RPB bound book and looked up the serial numbers for the carbines. They are 45xxx. This one is 45010, number 10. No wonder it’s made from old MAC parts. It’s one of the first ones RPB ever assembled, most likely before they were even machining their own carbine components

 

[BlackBelt]

Cool history

 

[MitchWerbellsGhost87]

Got the barrel off, thanks to our great friends at practical solutions. I had been considering heat to break the seal, so when Sam recommended hitting it with a torch I knew that it was gonna be the way. Sam was right of course and the barrel came right off! It lives to shoot another day! Preserving MAC history one demill at a time…

Before pics, mangled with the old glue all over it…






After, cleaned up, refinished and installed on a mint new old stock RPB M10 upper.
I still have to find the correct M10LR upper with the M1 carbine rear sight but for the time being this will have to do.

 

[JohnFreeman]

That is some really fine work. Thanks for the overview of the repair and the history. It sure got a rough treatment before it got to your hands.

 

[Jmacken37]

That's cool!

 

[boomer535]

It is nice work. You brought a piece of history back to life.