.224 air gun

How about this a kral breaker with fx 25 cal slug line and Jii Cooper complete new valve assembly including a valve stop to control valve duration,I have over fifteen custom built trifles,with fx barrels.4 with tj and i found walther polygon barrels to be superior to tj.Sell it get an fx barrel and liner and find someone really good to install it.And then the work begins to get just the right puff of air.

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I’d install in in a Winchester 70-35. I’ve converted one to .257 and once the magazine was modded . I can send 70 gr. 257420 bullets at 900 fps. In .224 it would t even need any valve or other power mods. Easily capable of well over 100FPE or shooting a 55 grain bullet at 900 + fps and still use it with a magazine. The full story is on the GTA. It’s much easier to get a big bore to make power with a smaller caliber than trying to make big power with a small caliber rifle. Another options would be a Evanix AR6 , super long magazine,on a Sumatra in .22 . Both capable of big power and long magazines. 

If your into single loading , the Texan in any cal wins in the power department. 
 
Jimmy001. That buid looks great.. I really enjoy custom builts ..to bad that I don't know nobody to send guns to have them modified..that's why I started with condor it was something I could do myself...my .223 n .257 ..the .257 could push 85g 970 fps...the .223 I have not been able to test fully because there is no bullet available to purchase n huben slugs only go up to 36g n I need something between 55g to 60g..I only use tj to shoot cast bullets..but I used to have a short barrel. 25 -- 1-22 twist n I shoot pellets awesome ..
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Mtnghost...od - 5.62 x 30" long so it could be cut to length...the .224 slugs the small ones will fit a cricket..up to 36g in the mag 44g single load...that would be ideal but I don't know if a .25 cricket platform could be made to push 44g of .223 at least 900 fps.

I meant the O.D. of the barrel itself. They sell them in 1/2" and 15mm ODs, if you have the latter - I would say Taipan Veteran 👍
 
You'll want a 250bar fill gun most likely. Seems the smaller the caliber the higher the pressure needed is for the same power. While not a true bullpup the Kral Knight is 250bar 500cc bottle and 70-80fpe with slugs in that barrel should be no problem. It's really the only budget friendly bullpupish gun I know with the volume and pressure I'd want to make a slugger from.