Just like the picture shows.
Extreme rear end of extension to the gas block shoulder.
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Copy as soon as I'm home I will respond with the length
So I had to measure without calipers but it's about 5 and 7/8 inches
With an accurately installed gas block and gas tube, the end of the tube should be very close to where this one ends: http://www.ar15barrels.com/gfx/gas-tube.jpg
https://farm5.static.flickr.com/4014...8b533b31_o.jpg
That doesn't appear to be any of the standard or known sizes ( and we've got 9 different sizes on the shelf ).
Your best bet is:
1) try and track down the source of the barrel and get a replacement gas tube
or
2) use the barrel for throwing practice.
Other options involve relocating the gas port or modifying a gas tube, but both of theses likely more difficult and time consuming than is worth doing.
I've ordered a ba 11.3 hanson to replace it, but with my flash can itll be about 14 inches anyone have any recommendations?
Recommendations as far as what?
I am running a 11.3" Hanson with a 10" ALG rail and a BRT Covert Comp. The barrel/comp combo works well for me, solidly reliable and I am happy with the pistol, although I don't claim my set up will appeal to everyone.
Andy
https://i.imgur.com/qJNmeD4.jpg
I finished putting it together this evening I will post pictures tomorrow some time, but I ended up with a kak slimline in the end of the barrel but would I need a stamp with that?
Attachment 59770 this is it. Shot about 250 rounds and started short stroking again. :confused: