The 2240 just has got to be THE Airgun bargain.
Overlooked by so many.
I suppose it's easily done....The old adage "you get what you pay for" is normally true and also, these days, you can spend a lot of money and still get crap quality.

But, with the 2240, I't does what it says on the tin......Even as standard, it's a great pistol, fantastic value for money, accurate, powerful and reliable.

With a few mods, they become even better.

I'd say the steel breech is the biggest single must have. I have now mini-carbined mine; it wears a 4x32 rifle scope and is AMAZINGLY accurate. If I ever reverted it back to a pistol, I'd probably fancy fitting one of those very nice looking MIM rear sights.

As mentioned above, scour the various sites.....GMAC, SD Custom Design and TR Robb in the UK.
Look at the various US Crosman sites.
Airgun Artisans is another site well worth a look; also check out Crooked Barn.
There is a a massive wealth of information out there on these fantastic little guns.

Enjoy!!