1. gathered combo fits century really well, gathered fits but grip end section will be slightly larger than the barrel's front part.
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Size Comparison (photo white level boosted to further reveal red color)
from left: platinum century(mini), platinum century(standard), platinum century gathered combo
1) Barrel and Cap for "Platinum Century & Gathered" combo (both compatible, although not 100% perfect fit for gathered)
(will no longer be produced, "gathered only" barrel and cap will be made in the future)
century grip section installed
*dust on the surface, not flaw
gathered grip section installed
as you can see slight inaccuracy @ the end of grip section (making both models compatible cannot be perfect)
2) barrel and cap for "platinum century #3776" (standard size)
standard century also fits president, but as you can see in the picture, there may be a small difference at the end of the grip section where the barrel meets.
3) barrel and cap for "platinum century #3776" ("mini" - same length as original plastic barrel)