Just finished building my .308 HPA Qb78

February 5 2012 at 10:10 AM

(Login madesigns94)
YC

I finally finished building my .308 qb78 with a JRA machined
riser and a JH bolt, barrel and tube and I am hoping to test it out today!!
Here is a couple of pics of it. If anyone has any advice or input, it would be
gratefully appreciated. Thanks in advance, Mark

[linked image]

Sorry for the upside down pic!

This message has been edited by madesigns94 on Feb 5, 2012 10:50 AM

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(Login captiveherps)
YF

What did you do for a valve ?

February 5 2012, 10:51 AM

Did you mod it ? buy a modded one ?

http://www.cafepress.ca/AK47andmore

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(Login madesigns94)
YC

ported

February 5 2012, 2:48 PM

used a QB valve that I had bored the port and lightened the spring. And I had to mod the bolt
because it was covering the port. I did have to mod the barrel a little bit and tried to straighten out the groove for the barrel band, It was so messed up it was off by about 5o degrees.

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(Login captiveherps)
YF

I have one of his tubes

February 5 2012, 6:15 PM

On a .22. I have been thinking of building a bigbore with one. Let me know how it works out for you with some chrony numbers if you have them.

http://www.cafepress.ca/AK47andmore

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