Question About Receiver Pins?

[charles_the_hammer]

I recently bought a M-10/9 parts kit. It hasn't arrived in the mail yet so I only have a couple of pics for reference. Pictured in the kit is what I am pretty sure is a receiver takedown pin but it doesn't look like any of the examples I have been able to find online. According to the schematic drawing on Numrich it would be a "Receiver Pin, Style C" but every actual photograph I have been able to find online of these things has the detent on the bottom. This one has the detent near the top? Pic below is two different angles of the same pin.



Also, while we are on the subject of receiver pins, what was the first style of receiver pin that was used after the very early ones that had the groove in the middle that released via the tab on the bottom? I've seen some that were threaded two piece, two piece with a long flat spring with detent on the end, and possibly a few more. My SAP has a one piece with spring-loaded detent.

Thanks for any info!

 

[brenbuilds]

If it fits it's largely irrelevant whether it is an original, aftermarket, or even something entirely different. It appears the ball detent is missing, but you can make that with a small spring a bearing ball and a center punch to stake it.

Some pins have been made of aluminum, Delrin, or sleeved with aluminum bronze. The Powder Springs MAC's have a solid bar stock take down pin with a recess machined in the center. A corresponding spring loaded detent holds it in place.

I have the old aluminum pin with the pull ring on my J.A.W.S. however I mostly have Lage upper on it so I use the common pushpin, steel detent type.

 

[charles_the_hammer]

Thanks. I think I might replace the one I got with one of those two-piece models that have one side that looks like it has an extractor spring.

 

[Deerhurst]

The earliest was just a grooved pin. Other than those uppers the pin doesnt really matter.

 

[charles_the_hammer]

The earliest was just a grooved pin. Other than those uppers the pin doesnt really matter.

I was trying to figure out which type they switched to after they moved on from the first type with the groove. I guess it was the detent pin type which is the one I have. It hasn't walked its way out or anything yet but it just seems a little too easy to remove which is why I was thinking about replacing it with one of the two piece kind.

 

[Deerhurst]

I want to say the detent is the newest. There is also a 2 piece pin out there.


Hopefully our guru/historian will be along soon. Werbellsghost is a wealth of knowledge.

 

[Mr. Greg]

I got a nifty 3 part pin with my M11/9 SABRE back in the day that screwed in from both sides. Haven’t seen it for sale separately since.

 

[charles_the_hammer]

Ever since I got this SAP, I have not really been digging this receiver pin. It's got a hole in each side of the pin which I do not find aesthetically pleasing at all. I just don't like the way those holes on each end of this pin look. The parts kit I purchased has a different style receiver pin included that is flat on one side and has a hole on the other side. One hole looks somewhat better - 50% better at least - than two holes but it doesn't really matter since the pin in the parts kit photo appears to be busted with no detent or spring in it.

As far as appearances go, I think the old "Powder Springs style" pin with the groove cut in the center are the best looking receiver pins. They don't have holes in them and they sit flush with the sides of the receiver which gives it a "cleaner look" in my opinion.

Since these holes really get on my nerves, I decided to look for a new receiver pin for my SAP. I have been perusing a bunch of MAC photos from all over the interwebs trying to find one.

Looks like at some point there was a two piece threaded model that folks were using. A flat head groove definitely looks better than a gaping hole but I would still rather have a flat surface on both sides to sorta emulate the Powder Springs look.

Another pin I am coming across a lot in these photos is that two-piece version with the long spring on one side that locks into place on the other half. These I think look pretty good even though they have a hole on one side. One side of the pin sticks out a little further from the side of the receiver than I would like, but it didn't annoy me enough to keep me from ordering one - which I came pretty close to doing until I happened to run across something that I liked better.

The receiver pin I finally settled on is made by Lage. It's called their "1-Piece Low Profile Receiver Pin". It uses a detent and doesn't have holes on the ends. It's not perfect but in my opinion it does the best job of replicating the look of the Powder Springs receiver pin. I'll take some pics when it gets here. Hopefully they look as good in person as they do online.

 

[brenbuilds]

Numrich has slotted takedown pins.

Receiver Pin, Style B (Solid Pin w/ Grooved Middle)

MAC OF TEXAS M11, M10 Receiver Pin, Style B (Solid Pin w/ Grooved Middle)

www.gunpartscorp.com

 

[MitchWerbellsGhost87]

Those are late MAC/RPB receiver pins, they were used on MAC Marietta guns in the mid 70s and then RPB used them until around 1980-81 when RPB briefly started to use a 2 piece pin with a flat head screw head before they went out of business.

There were 2 different versions of that pin, the one that MAC came up with had a solid head with the spring detent (no hole in the head), RPB came up with another version of it in the late 70s that was hollow all the way through, with a hole in the head that allowed you to see into the barrel of the pin (the one you have)

The grooved powder springs pin won’t work on your gun, it requires the latch assembly on the upper that was only on original powder springs guns.

The 2 piece M60 style pin you describe was sold by SWD and is the most “modern” version of the OEM MAC takedown pins

I personally prefer the RPB flat head screw 2 piece pin, they are very hard to find on their own but I have managed to stockpile a few new old stock examples.

 

[charles_the_hammer]

Those are late MAC/RPB receiver pins, they were used on MAC Marietta guns in the mid 70s and then RPB used them until around 1980-81 when RPB briefly started to use a 2 piece pin with a flat head screw head before they went out of business.

There were 2 different versions of that pin, the one that MAC came up with had a solid head with the spring detent (no hole in the head), RPB came up with another version of it in the late 70s that was hollow all the way through, with a hole in the head that allowed you to see into the barrel of the pin (the one you have)

That's some good info. I guess that means this kit I bought could be dated to the mid-70's due to this style of pin - which I was able to repair after the kit got here. It's also got the strap bracket behind the barrel lug wide enough to accept the spring clip on a Powder Springs style front strap.

The grooved powder springs pin won’t work on your gun, it requires the latch assembly on the upper that was only on original powder springs guns.

I knew I wasn't going to be able to use one like that on my SAP I was just looking for a pin to replicate the look as best I could which is why I ordered the one from Lage. I may end up using the one that came with this 1970's kit just to keep it original depending on how it fits.

The 2 piece M60 style pin you describe was sold by SWD and is the most “modern” version of the OEM MAC takedown pins

I personally prefer the RPB flat head screw 2 piece pin, they are very hard to find on their own but I have managed to stockpile a few new old stock examples.

I'm about to have a bunch of spare parts including FA parts, complete grip assembly, and complete upper after I get through swapping out this older upper from the kit for the one that came on my SAP. Maybe we can do some trading. I won't be using all the stuff pictured here: