Lots of info. if you do a search under the pistol section . I cannot give advice as far as .177 but I do like my 22 cal. . I added the (reg. gauge block) also made a cheek rest to make the extended stock more stiff, the rods seem too twist some if you use it as a carbine. Some will recommend the 700 for more power. The stock mags suck, but Air gun archery & fun in Canada has some others, also carm mags have a good feed back. Mine loves the crosman dome 14.3's . Are you intending to use it as a pistol or carbine style ?
Not really the bipod $27 I think painted silver , the cheek rest is a scrap 2x4 drilled a shaped with high den. foam, aluminum sheet formed ,tapped ,and screwed together for bottom of stock. Got the pistol on sale and added the gauge block, the x wrap I had left over from another build as well as the moderator. Just a fun build, as I never leave anything stock also the grips $63 .
Mine is a 177 and I added the aftermarket plenum to it. I've got it to 680fps but I wish itd do better. I find it to be a low powered plinker. It shoots well I was just hoping to get a 12ftlb gun out of it. The clips that hold the wire sto k break easily so stock up when wes at airguns archery and fun has them.
.177 ,it is a good pistol though it needs a little work to make it a lot better,like trigger work and mags from CARM...I get about 26 shots from my fill.
I like my Prods a lot better though, they cost $150 more.