what is pin size? - Page 2
Firearm & Gun Forum - FireArmsTalk.com > Long Guns > Auto & Semi-Auto Discussion > AR-15 Discussion > what is pin size?

Reply
 
LinkBack Thread Tools Display Modes
Old 07-06-2012, 03:37 PM   #11
Lifetime Supporting Member
FTF_LIFETIMESUPPORTER.png
Feedback Score: 1 reviews
 
Join Date: Mar 2011
Location: Santa Cruz Mountains,CA
Posts: 14,219
Liked 8456 Times on 4899 Posts
Likes Given: 11022

Default

Quote:
Originally Posted by Dillinger View Post
I believe Colt's bigger pin size were for the Takedown and Pivot pins, effectively making it impossible for you to assemble an "other" lower and slap a Colt upper on it.

I am not a Colt expert (or fan ) so I can't say for certain but I do believe that they only did this on those two pins, for a short period in production time, and that it did not effect your other pins.

As such I believe you are good to go Viking - you can always check and see if the trigger has any slop to it. If you shake the lower and it rattles like a baby toy, you have a problem.

JD
Quote:
Originally Posted by Quentin View Post
If the hammer/trigger pins are the large size they won't slide in a milspec stripped receiver. If they did fit you must have .154"pins from a fairly new or very old Colt.

ETA:
If you used small pins on the large hammer and trigger to make them fit then yes you have a problem.
Quote:
Originally Posted by Quentin View Post
BTW, Colt went to the large pins before the 1994 AWB hoping to distinguish its commercial ARs from military/LE. Their argument was the large pin "sporter" models would not accept triggers and uppers from "evil" ARs. Didn't work of course and caused needless headaches. They went back to milspec size after the ban sunset.
I was under the impression that the takedown pins were the only ones that differed in size, but I was wrong. The parts I have have the .250" takedown pins but the larger .171" trigger pins. I picked up some of the smaller pins at a LGS but didn't think about the trigger being the same .032" size holes (facepalm).

I guess the question is was the receiver, having standard takedown pin size and oversize trigger pins, a rarity and if so did that make it more or less valuable? (I understand that rare and valuable are not synonyms.) It is a moot point now because I do not have the lower, just all of the parts that were stripped off of it and a description with pictures. The guy I got the parts from was hoping that the ban would be lifted in CA, but, alas, this will not come to be.
__________________
Vikingdad is offline  
 
Reply With Quote
Old 07-06-2012, 04:19 PM   #12
Feedback Score: 0 reviews
 
Quentin's Avatar
 
Join Date: Apr 2010
Location: Idaho
Posts: 6,593
Liked 1027 Times on 723 Posts
Likes Given: 1028

Default

The large pin receivers are not a rarity but they are Colt so probably are in demand at least with some people. Especially if you need a large pin mate to a receiver you already have.

There are conversion pivot/takedown pins but I haven't seen that for the trigger or hammer pins, though the right size shim could work. I'd get a new fire control group, you don't want doubling or any unsafe condition. A standard LPK is cheap plus the spare parts are handy anyway.

__________________

______
The biggest issue with assembling an AR isn't so much getting the parts together right - it's getting the right parts together. You'll remember the quality of a gun long after you forget how much you paid for it.
________________________________________
US Army 1966-69, VFW Life Member, Retired Geek

Quentin is offline  
 
Reply With Quote
Old 07-06-2012, 04:29 PM   #13
Lifetime Supporting Member
FTF_LIFETIMESUPPORTER.png
Feedback Score: 1 reviews
 
Join Date: Mar 2011
Location: Santa Cruz Mountains,CA
Posts: 14,219
Liked 8456 Times on 4899 Posts
Likes Given: 11022

Default

I have plenty of LPKs, but you are right, spares are always handy to have around. Have you got any fire control groups you want to let go cheap? Maybe a two-stage?

__________________
Vikingdad is offline  
 
Reply With Quote
Old 07-07-2012, 12:31 AM   #14
Feedback Score: 0 reviews
 
Quentin's Avatar
 
Join Date: Apr 2010
Location: Idaho
Posts: 6,593
Liked 1027 Times on 723 Posts
Likes Given: 1028

Default

Nope, don't have any spares. I bought something like 7 LPKs (DD, Stag, ArmaLite and even Del-Ton) and kept the best 4 FCGs for my three ARs and a spare LPK. I sold the others LPKs for a fair price so it worked out for everyone since even those triggers were acceptable, with the DTI the worst.

Oh, some of the guys here have bought and like the ACT FCGs for about $65. It's a good milspec unit.

__________________

______
The biggest issue with assembling an AR isn't so much getting the parts together right - it's getting the right parts together. You'll remember the quality of a gun long after you forget how much you paid for it.
________________________________________
US Army 1966-69, VFW Life Member, Retired Geek

Quentin is offline  
 
Reply With Quote
Old 07-07-2012, 05:41 PM   #15
Feedback Score: 0 reviews
 
GREGULON's Avatar
 
Join Date: Nov 2011
Posts: 258
Liked 12 Times on 11 Posts

Default

Yeah yeah but what's the difference.

__________________
GREGULON is offline  
 
Reply With Quote
Old 07-07-2012, 07:07 PM   #16
Lifetime Supporting Member
FTF_LIFETIMESUPPORTER.png
Feedback Score: 1 reviews
 
Join Date: Mar 2011
Location: Santa Cruz Mountains,CA
Posts: 14,219
Liked 8456 Times on 4899 Posts
Likes Given: 11022

Default

Quote:
Originally Posted by GREGULON View Post
Yeah yeah but what's the difference.
The milspec standard is .154", that is what you need for the vast majority of the lowers out there, unless you have a Colt receiver with the .171" trigger pin holes. They also make .1555" pins (I have seen that Rock River makes these) which you can jam into the .154" holes which is supposed to prevent the pins from rotating I guess? but they make anti-rotating pin sets as well so I would be inclined to use those rather than an oversize pin set.

Of course I am a newbie to the world of ARs so take what I say with a grain of salt. And those of you more knowledgeable please let me know where I am wrong.
__________________
Vikingdad is offline  
 
Reply With Quote
Reply

Thread Tools
Display Modes


Similar Threads
Thread Thread Starter Firearms Forum Replies Last Post
What size punch? Scratchammo Blackpowder & Musket 9 03-14-2012 06:27 AM
Are Gen-4 Magazines a different size? PrimePorkchop Glock Forum 7 12-28-2011 12:06 PM
Gun size crock General Shotgun Discussion 10 12-07-2011 11:13 PM
ar 15 caliber size moneymaker17 AR-15 Discussion 23 10-11-2010 02:14 AM
Look at the size of this snake BudW The Club House 1 12-03-2009 02:00 AM