Cali_Ed Posted January 10, 2014 Report Posted January 10, 2014 Are they the same length? I tried putting a r15 one i had laying around in my tm 308 lower but it seems to long the detent doesn't go all the way down to allow the pin to go in
98Z5V Posted January 10, 2014 Report Posted January 10, 2014 Same spring. In fact, pivot pin spring and takedown pin spring are the same, AR-15 and .308 AR. Same one. In the pivot pin, it doesn't go all the way in - the detent sticks out. You need to compress it with the pin, or compress it to get the pin in there. It can be tricky. Attempt to assemble it inside a 1 gallon zip-lock freezer bag - because when the thing shoots out, it won't go far... If you attempt to assemble it uncovered, and it shoots across your room - you will never see it again...
98Z5V Posted January 10, 2014 Report Posted January 10, 2014 Tell you what - have you assembled the takedown pin yet? Use the takedown pin to assemble the pivot pin, then put the takedown pin in.
Cali_Ed Posted January 10, 2014 Author Report Posted January 10, 2014 It was way easier on my 15 everything went smooth, this one just wont compress down. I tried but then gave up becuase i started thinking of cerakote or some coat of some sort lol. I've been lucky to find the detent once or twice what i havent found is an old bolt catch pin lol
98Z5V Posted January 10, 2014 Report Posted January 10, 2014 Check the detent pin without a spring in there, first - if that thing won't go in the machined hole for it, you might need to employ some small drill bits and "fix" that hole a little bit.
Cali_Ed Posted January 10, 2014 Author Report Posted January 10, 2014 I'll have to inspect that, just seems like the spring gets compressed all the way and that why it wont go in any more. Ill double check
98Z5V Posted January 10, 2014 Report Posted January 10, 2014 (edited) Might be a "machining problem" on the lower, then, if that hole isn't the proper depth. I don't have an unassembled lower on me right now, or I'd measure it for you - someone here has to have one, though. It's gonna be the exact same depth on a .308 AR as it is on an AR-15 lower, so just about any lower should do for measurement... EDIT - Eff it, I've got a built lower that I'll strip down tonight... I'll get a measurement back in here before the clock strikes 12... I can take some additional pics, then, and show you how to get that thing together easier... Edited January 10, 2014 by 98Z5V
Cali_Ed Posted January 10, 2014 Author Report Posted January 10, 2014 That would really suck if the machining wasn't done right -______- sigh citing the spring bad? Thank you bunches for your efforts
BRD51 Posted January 10, 2014 Report Posted January 10, 2014 Could you be trying to install the stiff safety detent spring instead of the front pivot spring? The front pivot pin and rear takedown detent springs are the same but the safety detent spring is different. That is the one that fits in the grip. It is significantly stiffer than the other two springs but I think it is the same diameter and length.
Cali_Ed Posted January 10, 2014 Author Report Posted January 10, 2014 No i thought that aswell and double cheeks maybe I'll take a picture
98Z5V Posted January 10, 2014 Report Posted January 10, 2014 Safety spring is larger in diameter... Won't fit in the detent hole, unless the machining was bad and that hole is huge. We've seen some huge holes before... :eek: <dontknow> <laughs>
Cali_Ed Posted January 10, 2014 Author Report Posted January 10, 2014 (edited) This is how far i can get the pin in maybe thats how far it goes? I remember it went all the way down on my 15 Edited January 10, 2014 by Cali_Ed
98Z5V Posted January 10, 2014 Report Posted January 10, 2014 Spring + pin. What's that other thing in your pic, between the spring and the pin? That ain't right.
Cali_Ed Posted January 10, 2014 Author Report Posted January 10, 2014 What I was using to push it through the hole so i could keep the pin down with something else i need a new Allen key set lol missing the smallest one so had to improvise
98Z5V Posted January 10, 2014 Report Posted January 10, 2014 Got it. Ripping apart a lower in a few more minutes. Measurements inbound.
survivalshop Posted January 10, 2014 Report Posted January 10, 2014 You can use a dill bit that's close to the spring hole dia. & just using your fingers , spin it in the hole & see if its got a burr or the depth of the spring hole is wrong or too shallow . You can always cut the spring down if the hole is not deep enough. 98 I can beat you , I have a lower unassembled in the safe, but I know how much you want to disassemble that pivot pin, so I won't measure it .
98Z5V Posted January 10, 2014 Report Posted January 10, 2014 As fate would have it, that lower I have is locked in a gun locker - to which the key is on my Dodge keyring. Which would be in Dawn Marie's purse about now. At work. Never an issue when I was the only one that drove the truck... :-[
BRD51 Posted January 10, 2014 Report Posted January 10, 2014 The drill bit can be a little larger than necessary if you don't have the exact size bit. I have drilled out Polymer lowers, nearly all of them, as much as 3 wire size bits larger and the detent still worked fine.
survivalshop Posted January 10, 2014 Report Posted January 10, 2014 (edited) I would not make the spring hole any larger , the drill bit is just to take measurement & make sure the hole is clear of anything from machining marks or burr's . I'll measure mine 98. 1.130" on my BRO lower, I used a straw from a spray lubricant , to take & measure . If you need the spring length , let me know ,I buy them by the ten's ,because so many lose them & its detent. Can you see the spring in the oiling hole , for that spring , if it has it , some lowers don't , my CMMG doesn't . Edited January 10, 2014 by survivalshop
Cali_Ed Posted January 10, 2014 Author Report Posted January 10, 2014 I'll have to check when I get off wok
Cali_Ed Posted January 11, 2014 Author Report Posted January 11, 2014 Thanks for you help and time guys. Fixed my problem got a hefty set of Allen keys and stuck one down the hole lol and cleared up some shavings now it fits like a glove :) Thanks again Ed
Recommended Posts
Create an account or sign in to comment
You need to be a member in order to leave a comment
Create an account
Sign up for a new account in our community. It's easy!
Register a new accountSign in
Already have an account? Sign in here.
Sign In Now