Clifford
01-18-2013, 10:35 PM
So after hearing Mike M. had some .22 b-50's in stock I had to try one. Ordered from him bone stock, straight off the boat from China.
When it first arrived it held some pressure but leaked down to around 1k
so I tore it down (sorry no pictures as I had just gotten it) and put in a replacement o ring that it was shipped with. O ring #18 in exploded view here:
http://i99.photobucket.com/albums/l320/cklindt/B50_51/b50_parts_schematic.jpg
This solved the leaking down problem but the next day the fill valve o ring and breech seal blew as well. I will say that the #006 seals were probably in the worst condition on this gun.
Once I let it sit overnight and knew it wasn't leaking down I did some rough chrony testing with 2.8k fills. Sorry, I'm still figuring out my chrony lighting situation so I don't always get the best strings but the gun was shooting 15.89gr JSB's at a high around 900fps and stable around 885fps, easily hitting between 25-28fpe out of the box (not bad)
Moving forward, I opted to look into 2k fill tweaks for the b50 since I do not have a 4500psi tank (yet)
I was lead towards the "book" found here:
http://www.toolfarm.no/ViewFile.aspx?itemID=430
And placed an order for the McMaster-Carr spring, part #94125K125
They come in a 5 pack and are relatively inexpensive.
In the next section I'll discuss installation procedure for the spring and my terrible chrony work will rear it's head yet again.
When it first arrived it held some pressure but leaked down to around 1k
so I tore it down (sorry no pictures as I had just gotten it) and put in a replacement o ring that it was shipped with. O ring #18 in exploded view here:
http://i99.photobucket.com/albums/l320/cklindt/B50_51/b50_parts_schematic.jpg
This solved the leaking down problem but the next day the fill valve o ring and breech seal blew as well. I will say that the #006 seals were probably in the worst condition on this gun.
Once I let it sit overnight and knew it wasn't leaking down I did some rough chrony testing with 2.8k fills. Sorry, I'm still figuring out my chrony lighting situation so I don't always get the best strings but the gun was shooting 15.89gr JSB's at a high around 900fps and stable around 885fps, easily hitting between 25-28fpe out of the box (not bad)
Moving forward, I opted to look into 2k fill tweaks for the b50 since I do not have a 4500psi tank (yet)
I was lead towards the "book" found here:
http://www.toolfarm.no/ViewFile.aspx?itemID=430
And placed an order for the McMaster-Carr spring, part #94125K125
They come in a 5 pack and are relatively inexpensive.
In the next section I'll discuss installation procedure for the spring and my terrible chrony work will rear it's head yet again.