The Stoeger X10 and X20 models are essentially the same, mechanically. Same "shooting parts", performance, same trigger etc. Both are rated by the manufacturer at 1,000 fps with lead pellets. I'm seeing a very consistent 900 fps+ with CPLs.
Differences are primarily in the stock and scope combinations.
The Stoeger X10 has a simple sporter stock. The X20 has a "Monte Carlo" style design offering an improved cheek weld. The X10 is available with a choice of wood or black synthetic stocks. The X20 offers wood, black synthetic and the "Realtree" pattern synthetic stocks.
Another difference is in the scope supplied with the combos. X10 models are fitted with a 4 x 32 scope with two-piece mounting rings. The X20 has a 3-9 x 40AO scope, together with a much stronger one-piece scope mount.
All the Stoeger X10, X20 and X50 combos that we have are fitted with pre-mounted, pre-sighted scopes. The X10 scope is not AO and is factory-focused for 100 yards which gives a very soft image at 10 yards. But for the models sold by Archer Airguns, I re-focus the scope so that it gives excellent sharpness down to 10 yards. Much better for airgun use!
I hope this helps...
Stephen Archer
Archer Airguns Inc.
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