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ChrisO
09-22-2010, 7:56 PM
I have a spikes lower with a commercial buffer on it. Is the lower made for a commercial buffer or are the pitch on the threads the same and same diameter and the diameter just differs on the outer portion? I'm wondering if I can change to a milspec buffer or I need to get another lower. My concerns are the mil spec is made of stronger metal and I remember reading somewhere the threads go deeper into the receiver. I don't want to have to worry about this.

DK9mm
09-22-2010, 7:59 PM
Either one will work fine.

Josh3239
09-22-2010, 8:01 PM
Same lower, different sizes:

http://www.laruetactical.com/pics/BufferTube/CTR_Stock_Specs.jpg

ChrisO
09-22-2010, 8:08 PM
Cool, Wonder why anyone would go with commercial over mil spec then? Is it cheaper or something? I guess I'll have to pick up some milspec stuff. Well a whole milspec set up is going on the accessories page with a vltor emod just to let ya guys know ;) .

tomd1584
09-22-2010, 9:50 PM
Buffer? You mean receiver extension.

ChrisO
09-22-2010, 9:59 PM
Buffer tube, Correct?

tomd1584
09-22-2010, 10:14 PM
Technically called receiver extension. Most people just call it the buffer tube since it houses the buffer & spring.

ChrisO
09-22-2010, 10:31 PM
Well in that case yes I meant the receiver extension haha. See learn something new everyday.

Capt. Speirs
09-23-2010, 6:54 AM
Commercial Receiver Extensions are cheaper and weaker than Milspec. If you have a choice, go Milspec, you will then have a much larger selection of stocks, IMO.

ChrisO
09-23-2010, 7:38 AM
But you guys are saying I can put a mil spec receiver extension on my lower, They are not milspec/commercial specific? I was confused since the OD's are different. Is it a taper?

glockmeister
09-23-2010, 11:14 AM
I recently changed from commercial to milspec. I had no idea the two existed when I got it. Now that I know, milspec is what I wanted. Just an FYI, the castle nut will fit both a commercial and milspec. The buffer and spring will fit too. 28 bucks for a DD milspec tube.

Josh3239
09-23-2010, 11:48 AM
But you guys are saying I can put a mil spec receiver extension on my lower, They are not milspec/commercial specific? I was confused since the OD's are different. Is it a taper?

It is approximately .015'' different. And it is threaded. You understand that at that small of a different it is just a matter how deep the threads bite? There is no commercial tube lower nor a mil-spec tube lower. All lower extention "towers" are drilled to the same diameter and the threads are cut with the same tap. There is a very teeny tiny difference that makes no functional difference as far as screwing in the extention goes.

You are getting hung up on the wrong details. If you have a commercial extention you need a commercial stock. If you have a mil-spec extention you need a mil-spec stock. Commercial extentions are weaker and have less stock options. The lower is not your concern.

Nathan Krynn
09-23-2010, 12:19 PM
From the story I was told a long time ago a 4 letter word found it easier to export rifles with commercial buffer tubes and AR-15 carriers as it was not the same as USA military equipment. How true this is I don't know.

tomd1584
09-23-2010, 12:21 PM
It is approximately .015'' different. And it is threaded. You understand that at that small of a different it is just a matter how deep the threads bite? There is no commercial tube lower nor a mil-spec tube lower. All lower extention "towers" are drilled to the same diameter and the threads are cut with the same tap. There is a very teeny tiny difference that makes no functional difference as far as screwing in the extention goes.

You are getting hung up on the wrong details. If you have a commercial extention you need a commercial stock. If you have a mil-spec extention you need a mil-spec stock. Commercial extentions are weaker and have less stock options. The lower is not your concern.

perfect explanation.

ChrisO
09-23-2010, 1:57 PM
It is approximately .015'' different. And it is threaded. You understand that at that small of a different it is just a matter how deep the threads bite? There is no commercial tube lower nor a mil-spec tube lower. All lower extention "towers" are drilled to the same diameter and the threads are cut with the same tap. There is a very teeny tiny difference that makes no functional difference as far as screwing in the extention goes.

You are getting hung up on the wrong details. If you have a commercial extention you need a commercial stock. If you have a mil-spec extention you need a mil-spec stock. Commercial extentions are weaker and have less stock options. The lower is not your concern.

I know if I have a commercial spec tube I need commercial spec stock but what I was wondering if I could use either tube in any lower. Now I understand that I can. I have a commercial spec tube and commercial spec stock but I am wanting to go mil spec so I was just making sure I wouldn't waste my money. Thanks for all the help guys! I appreciate the replies.