Si to be Honest Bud,
Just get a MK 2 Rapid and buy a second hand MFR Stock, That Way you can still use a 400 cc buddy bottle or 280 cc buddy bottle,
Or even your 200 cc BSA Bottle off your R10.
MFR 's are limited to the Special 280 cc bottle designed for them, But the MK 2 can use the 400, the other type of non MFR 280 cc bottle
and your 200 cc BSA bottle, So your not limited to one size of buddy bottle Plus the MK 2 will Use the huge 500 cc Buddy bottle if you wish
More options Bud, Thats what alot of the lad's on the Rapid forum have done.
Daz 7