The barrel from Crosman made this a very cost effective project. If I'd had to buy a LW barrel, this just wouldn't have happened. I still need to do some valve mods, but even as it sits, its a lot of fun to shoot. Handling the .25s compared to .177 pellets is a dream.
http://anotherairgunblog.blogspot.com/2018/09/converting-qb-to-25-caliber.html
I thought about converting 1 of my Corsairs which is a QB conversion to a 25 cal . One of TJ linners is just a touch larger in OD . I have all my Corsairs packed for a move . I do not think the LW barrel is long enough to clear the tube . I have several 25 caliber rifles now . So maybe I can come to my senses and forget this conversion . Its been on my mind for over 5 years . The Corsair I had converted to a .452 I should have made into the .251 . Marvin
Good to see folks still converting QB's....seems less popular (or at least a lot less posts) now that some lower cost PCP's/HPA's have entered the market, but can promise you you'll learn a whole lot more converting one.
QB is a good choice for a caliber conversion, the barrels aren't all that complicated (no threads to cut).
HAve done two, one in .25 (LW barrel) and one in 5mm (HW barrel). You did a better job with your conversion; didn't have a mill so there was a whole lot of filing going on to make that loading platform.
I can't take credit for this .25 bolt...Mountain Air did the bolt, and a nicer hollow .25 bolt probe I haven't seen.
Used them both as 12gr. rifles, then bulk fill, then co2 tankers (converting the long 78 tube with minimal shortening), then HPA tankers.
With the .25, I got "power hungry"and put it together with a 3K PCP tube.
With the 5mm, ran it as a 150 shot 13 foot pound 5mm for a long time, putting it back together as a 2X12gr. CO2 rifle for the summer, but going back to the same HPA confiduation this month (in time for Squirrel season).
They don't get posted much the one's that have stayed in the line up have all pretty much stayed just the way there were years ago (even the scopes).
#1. DOES NOT COUNT....it's a Beemaqn "cheif" and have better little to do with QB's as only the trigger and open sights are the same.
#2. .22 QB 78D PCP conversion. Really not a whole lot of volume in that skinny 3K tube, but you can make it to 60 foot pounds for about 8-9 shots, or 50 foot pounds for
#3. 5mm conversion as a co2 rifle. It's about time to drop it back into it's HPA bottom and stock, retune it, and get ready for October's squirrel season:
Besides...it's "prettier"when in it's HPA stock.
#4. .22 QB 79 HPA carbine. I've worked on this one, including an ultra lite striker. It's low-low power for an HPA rifle, but very useful (and quiet) with 300 shots at 9 foot pounds.
#5. When "whole hog" on this like .177 QB carbine. Spend the $ on a one-off C1 stock and converted to to the HiPAc system of PCP.
Crappy picture above...lets see what I really spend my $$ on:
#6. .177 AE2078 Evntually got this one running for 195-200 12 foot pound .177 shots with it's 850PSI HPA bottle.
KEEP ON KEEPING ON my friend....there is a whole lot of good to be gotten out of the basic QB platform. Co2/HPA/or PCP, it's a very adaptable platform.
Each step along the way teaches you a "CARP" load along the way.
Yeah...I did avoid mentioning a whole lot of dead ends that didn't lead me to where I wanted to go...but so what? I learned as much or MORE from those than the ones that did work out).
I think both of you have done well . I am glade to see you used one of Roy's bolts . What I thought about doing was buying a breach and having Roy make a bolt for it . And either a LW or a TJ barrel . Pull the breach and barrel of a Corsair and replace it with the 25 caliber set up . Roy said he was able to cut a lead in the barrel so I can use bullets instead of pellets . Marvin
Since the Crosman Model 160 is the vintage-classic airgun that sucked me into the black-hole of airgun collecting and subsequent campaign of smithing them to levels of competition previously unimagined, of course I'm also pretty nutty about the Chinese 160-reproduction QBs. QB personal highlights for me include-
Second place in Hunter Class at the 2009 U.S. Field Target National Championships, just 2 points behind the now-disgraced and banned "Champion" who used a scope modified to be 20-22X when set to the 12X setting. Consequently I consider myself the 2009 Hunter Rifle National Champ. Oh... also the 2014 National Champ, since the same cheater used a rifle modified to cheat the 20 FP power limit (he got caught cheating with that rifle in 2015 and got banned). Here's the QB I used at 2009 Nats-
My current customized QB has only been used in one field target competition, but handily won Hunter Rifle class in shooting the HOA score of all classes that day (including Open and USFT class National Champions). While it isn't quite as accurate as my usual RAW TM1000 field target rifle that averages .56" five-shot groups at 50 yards, the customized QB averages only about 1/10" larger groups (.60 - .70" at 50 yards). Here's that QB-
BF, I designed that stock (configuration) for a Crosman 160 I had in the 1980s, and had an OLD gunsmith in Fort Worth build it for me (back then). I eventually sold the custom-stocked Crosman 160 to Tom Anderson (now deceased) in the late eighties; then when he passed away I bought it back (installed on a QB). I then converted the QB to regulated-HPA tank and modified the stock accordingly.
