proper buffer for SA20?

[Longshot338]

Hello all,

I just purchased a Diemaco/ColtCanada SA20 upper.

I plan on hand loading for it with 69gr projectiles and Hodgdon BL-C(2) powder.

I have a Smith and Wesson lower. Not sure what buffer is in it now...

What is the appropriate buffer to use? BL-C(2) powder is a bit on the slower end of 5.56 powder burn rates. I know this will result in a slightly greater gas port pressure. Should I be running a heavier buffer to compensate for that? What buffer would you reccommend?

Thanks guys!

 

[r_taylor]

Fixed stock or collapsible? If fixed, rifle buffer, if carbine, HH carbine buffer

 

[Longshot338]

It is a carbine style stock.

Which leads me to another question. Why a different buffer for each stock? How does the stock style require a different weight of buffer?

 

[COLT CANADA]

Fixed stock or collapsible? If fixed, rifle buffer, if carbine, HH carbine buffer

This is not true. Both SA models use the HH buffer. There are a number of threads talking about why already.

 

[Gunnerlove]

I think Matt miss read the post.
Both SA models come with Carbine stocks thus, Carbine receiver extensions and HH Carbine buffers.
If you play parts gun and try to run a carbine buffer in a rifle length receiver extension you will hammer your AR to pieces in pretty short order.