+1 My .25 Warp was VERY accurate. And FYI Jim recommends lubing your pellets with Fp-10 (what he rec. but any lube should do). My barrel needed frequent cleaning until I started lubing my pellets and that help a lot. I believe this is due to the tight choke on the MMHF barrels.
I have a MM barrel in my .22 Mrod. big difference from the barrel it came with. I also was lucky to get a good .22 barrel with my gen 1 mrod unlike so many others apparently. The MM barrel is worth it.