Bushmaster buffer retainer??

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ValleyGunNut

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Hey guys, I don't know how I've done it but I've lost my buffer retaining pin and spring, like I said don't know how I did it lol feel like an idiot.... Where can I get a new retainer and spring? I've seen a few complete lower parts kits but I hate to buy the whole thing for just 2 parts... Preferably in Ontario

Thanka for the help!
 
Your talking the castle nut on the buffer tube itself? So the buffer tube is supposed to go in far enough into the receiver that it holds the retainer in place?
 
ValleyGunNut said:
Your talking the castle nut on the buffer tube itself? So the buffer tube is supposed to go in far enough into the receiver that it holds the retainer in place?
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Yes part of the receiver extension aka buffer tube should be covering a small part of the hole the buffer retainer pin and spring are in to hold it in the gun this is one of the many reasons staking a castle nut is important.

Like this:
D10689.jpg
 
That makes sense as to why it fell out then, bet any money the guy that had it before me didn't have the tube in far enough as he must of had it off to install the magpul sling adapter.... Thanks for the help guys, will be correcting this when I receive the new pin for sure
 
greentips said:
You can just blue loctite it, if you don't like staking.
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Staking is a far better option than blue or red loctite it won't fail when introduced to solvents unlike loctite will. I've seen many a shooter in basic carbine courses back in the US who had basement assembled guns that used loctite or nothing at all end up having to borrow an extra rifle/lower because their castle nut and receiver extension backed out and shot the lowers guts everywhere and they couldn't find all the pieces.
 
bkelly4790 said:
Staking is a far better option than blue or red loctite it won't fail when introduced to solvents unlike loctite will. I've seen many a shooter in basic carbine courses back in the US who had basement assembled guns that used loctite or nothing at all end up having to borrow an extra rifle/lower because their castle nut and receiver extension backed out and shot the lowers guts everywhere and they couldn't find all the pieces.
Click to expand...

Locktite is not a glue for loose/unattached or free hanging surfaces, it only holds the torque that is put on the nut - if the nut is not torqued sufficiently in the first place (or the surface area is not cleaned), loctite is not going to help.

Lots of people think loctitie or even rocksett is a glue for free hanging surfaces- they are not. They are there to hold the torque that is applied to the nut in the first place.

Lower receiver extension is not exposed to high temperature, so loctite is completely adequate. I have a 20,000 + round lower with a blue loctited extension nut, because it is done correctly.
 
I agree with the loctite working, as long as the torque is applied to the nut the loctite will harden up, it's anobaric meaning it cures and hardens with lack of air... I'll definately be fixing this problem when I get my parts, may as well do it right
 
I had mine go flying once before. Lost the little spring for the buffer retainer. I used a spring from a clicky pen as replacement. Works great.
 
greentips said:
Locktite is not a glue for loose/unattached or free hanging surfaces, it only holds the torque that is put on the nut - if the nut is not torqued sufficiently in the first place (or the surface area is not cleaned), loctite is not going to help.

Lots of people think loctitie or even rocksett is a glue for free hanging surfaces- they are not. They are there to hold the torque that is applied to the nut in the first place.

Lower receiver extension is not exposed to high temperature, so loctite is completely adequate. I have a 20,000 + round lower with a blue loctited extension nut, because it is done correctly.
Click to expand...

Loctite isn't as good as staking there is a reason why any duty grade AR15 has the castle nut staked and why it is part of rifle assembly according to both FN and Colt in their M16/M4 and AR15 armorers courses.

Loctite will break if exposed to any moisture for prolonged periods which is pretty common with cleaning, lubrication, plain old precipitation working into the threads. I have seen atleast 5 home assembled ARs #### the bed in the middle of classes I've been in a year due to the receiver extension backing out because the rifle because the student didn't stake the castle nut when they assembled the rifle.
 
Loctite ( OK loctite thread locker) is designed specifically to lock threads and work as a gasketing materials against oil and moisture. That is its purpose.

When Ar15 was first mass produced in the 60's, loctite thread locker was just being sold. Staking is also cheaper and requires no additional material inventory, but theoretically the nut and the plate will not be reused once they have been staked and then taken off.

We use thread locker with all the screws in scope mounting, we never worry about the rain. High heat is the enemy to loctite thread locker, not oil and water. Rocksett is a different story though, it doesn't like water but it can go up very high in temperature because it is a cyanarcylic.
 
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