The 25 shot tube (Daisyspeak for the barrel) will work in the 111, and you already know you need a spacer so it tightens up the way it should, so you should be GTG. Shot Tube Assembly is part number 169866-000
Yes, you need to call in the order. Be prepared to wait. The muzak isn't the worst, but the quality of the recording really is!
Daisy contact info:
PHONE 1-479-636-1200, option 1
HOURS (ET):
MON - THUR 9 - 6
FRI 9 - 4
G'luck!
ETA- If you have questions, you can always just ask here, or if you need a quicker answer feel free to email me at cobalt 327 at hotmail dot com. The reason is, since I offered to field 'outside the box' questions for them, they tell many callers to contact me anyway.