[ARCHIVED THREAD] - receiver extension question

Posted: 2/21/2010 9:25:41 AM EDT

I just looked at this huge chart which shows different diameters for the receiver extensions. 1.14 vs 1.17 diameter. I purchased two SI defense lowers and I dont know what diameter they are. I guess this makes a difference when ordering stocks and buffer tubes/extensions? I didnt see on the SI defense website which size they are. theres no identifying marks on the receiver itself. how do I find out which one I have and which parts I need to order?

Thanks

Posted: 2/21/2010 9:47:03 AM EDT

[#1]

It doesn't matter you can use either commercial or milspec. There are more stock choices with milspec and the extensions are a little more price wise. I used commercial cause that was what I found on the EE for my SI lowers.

[ARCHIVED THREAD] - receiver extension question

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[ARCHIVED THREAD] - receiver extension question

[ARCHIVED THREAD] - receiver extension question