A2/A4 stock spacers - are they all about the same?

I bought a Colt OEM A4 stock from Brownell’s awhile back and want to use it for a 20” rifle build. But these don’t come with the top screw in the butt stock or the butt cap spacer.

The only butt cap spacer I can find available is made by someone called Luth-ar LLC. Are these good to go?

I would buy Colt for a Colt stock but I can’t find any.

Thanks for any user feedback...

http://www.specializedarmament.com/%...buttcap-nylon/

Specialized Armamaent in the link above and Brownells here. > https://www.brownells.com/rifle-part...prod22847.aspx

Here's a good source for the top screw. > https://yhm.net/buttcap-screw-with-nylock.html Brownells has Colt stock screws but they cost quite a bit more and it's hit or miss if you get one with the drain hole.

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Originally Posted by 556Cliff

Here's a good source for the top screw. > https://yhm.net/buttcap-screw-with-nylock.html Brownells has Colt stock screws but they cost quite a bit more and it's hit or miss if you get one with the drain hole.

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I little off topic, but the manual says not to re-use these screws and that they should be replaced when removed. Do you (or anyone) know why that is?

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Originally Posted by titsonritz

I little off topic, but the manual says not to re-use these screws and that they should be replaced when removed. Do you (or anyone) know why that is?

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It's due to the Nylock patch. Every installation degrades it since it just causes a friction fit. YHM also sells the same screw without the Nylock patch and you can just use your own threadlocker. > https://yhm.net/buttcap-screw-without-nylock.html

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Originally Posted by titsonritz

I little off topic, but the manual says not to re-use these screws and that they should be replaced when removed. Do you (or anyone) know why that is?

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Same reason you aren't supposed to reuse any self-locking screw.

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Originally Posted by 556Cliff

It's due to the Nylock patch. Every installation degrades it since it just causes a friction fit. YHM also sells the same screw without the Nylock patch and you can just use your own threadlocker. > https://yhm.net/buttcap-screw-without-nylock.html

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Quote:

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Originally Posted by lysander

Same reason you aren't supposed to reuse any self-locking screw.

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Thanks for info.

A follow-up question:

Do milspec/issue rifles use the nylon spacer, now? For some reason I thought they used aluminum...

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Originally Posted by Buncheong

A follow-up question:

Do milspec/issue rifles use the nylon spacer, now? For some reason I thought they used aluminum...

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Unfortunately I don't have an answer on that... I think they used to use aluminum spacers, but that's just a guess. It's also been impossible to find out if newer military issued M16A4s with rifle stocks have aluminum or plastic trap doors.

The buttcap spacer has been plastic since 1988.