A member of another fourm I am on is sendng me a rifle length gas tube, I just have to find my own roll pin. I would like to find a place that is no $5 shipping for a $.50 part, any ideas?

you should be able to get 2 for about $4 total shipped here
"Small Parts which fit in a padded first class envelope or small box, $2.00-$7.50 depending on weight."

I can send you a roll pin. I will send it in a normal envelope with stamp. USPS has been running slow, so it might take awhile though.

I would really appreciate it, thanks. I will send you a PM

I bought a box of assorted roll pins from Harbor Freight a few years ago.
I got it on sale for less than $3.00. ( regular price is around $7.00, That is a little over  $.02 each)

So, far it has had every pin I needed. (lost when trying to install)
315 Piece Roll Pin Assortment

Finish Black Oxide
Material Steel  

Some of the Size(s) (4) 1/16 in. x 3/16 in.; (4) 1/16 in. x 5/16 in.; (4) 1/16 x 3/4; (4) 5/64 in. x 1/4 in.; (4) 5/64 in. x 1/2 in.; (4) 5/64 in. x 1 in.; (4) 3/32 in. x 5/8 in.; (4) 3/32 in. x 1-1/4 in.; (5) 1/8 in. x 5/8 in.; (5) 1/8 in. x 1 in.; (5) 1/8 in. x 1-1/4 in.; (4) 5/32 in. x 5/8 in.; (4) 5/32 in. x x1 in.; (4) 5/32 in. x 1-1/2 in.; (5) 3/16 in. x 5/8 in.; (5) 3/16 in. x 1 in.; (5) 3/16 in. x 1-1/4 in.; (4) 7/32 in. x 5/8 in.; (4) 1/4 in. x 5/8 in.; (4) 1/4 in. x 1-1/4 in.; (4) 1/4 in. x 1-3/4 in.; (4) 5/16 in. x 3/4 in.; (4) 5/16 in. x 1-1/2 in.; (4) 5/16 in. x 2 in.; (2) 3/8 in. x 3/4 in.; (2) 3/8 in. x 1-1/2 in.; (2) 3/8 in. x 2 in.

The gas tube roll pin ( 5/64 dia x 5/16 ) is a odd ball length not normally found in a hardware store unless you buy a longer one and cut it down.

I usually go to the local industrial Hardware/ Fastener  supply house and buy the odd ones, they are usually cheaper too. You can also get the true roll pins vs the tension pins.