MA-19 Round Shell MS
Initial Release: Autumn 2004, Booster MA-19 (Green)
Additional Releases: None.
Bit Protector - "Large Type"
Should be noted that BP Size Type on initial release is not consistent for every cycle of production or re-release. Being reproduced the following year could mean a different BP Size Type for a given Beyblade.
Attack Ring (AR)
Turtle Crusher, ~20g.
Great weight and decent design, looks and plays very much like Plastics' Bearing Gyro AR.
Despite the conservative look, Turtle Crusher has fairly high recoil thanks to the gap between the plastic and Metal Frame, affording it a lot more knock out power than one would think.
Had the gap not been so prominent, with thick plastic jutting out, it may have been a good choice for Defense combos. In its current state, there is no doubt its best bet at performing well is in an Attack setup.
Given that much of its power is coming from the crevice between the Metal Frame and plastic, right-spin is best able to take advantage of that and preferred for Attack setups.
Unfortunately, unlike Bearing Gyro AR, using it on a metal-tipped Tornado Staller isn't viable. This is likely because Turtle Crusher lacks some of the raw power needed to secure knock outs on non-rubber tips.
Best Potential Combo:
AR: Turtle Crusher (Right-Spin)
WD: Circle Wide
Game Plan: Flower pattern using your technique of choice, be it Sliding/Catapult or Banking. Getting a solid hit or two while at high speed is Turtle Crusher's best bet at scoring a knockout and showing the power it can unleash in specific circumstances. While it isn't something incredible, it is worth noting and respecting for what it is, a decent enough Smash Attack AR.
Round Shell MS' Running Core, Rubber Weight Core, assumes the role of both a WD and RC, so it does not come with a dedicated Weight Disk.
Rubber Weight Core, ~20g.
Very, very tall, relative to other HMS parts.
Decent enough weight, but severely held back by its tip design. If Bearing Core didn't exist, perhaps RWC would be exceptional.
Does not make a particularly good spin-stealer, despite the overwhelming majority of the time contact will be made with smooth rubber when using RWC.
A very niche RC that can be used to mess with top-tier stamina combos in same-spin matchups.
Best Possible Combo:
AR: Metal Ape (Same-Spin)
RC: Rubber Weight Core
Game Plan: This combo has only one particular use: defeat Bearing Core based Stamina combos in same-spin. Unlike Spring Core which shares this same niche, it lacks a bit of consistency against every flavour of Bearing Core combos (particularly Circle Upper), but is still reliable enough to be recommended. This combo's height is problematic for Bearing Core, as it tends to precess when hit from above, and while this isn't technically a display of Force Smash, it is entertaining and unique to watch Rubber Weight Core destabilize Bearing Core, "suggesting" it spin downwards to its death. You shouldn't expect this combo to hold its own very well in opposite spin matchups or against Attackers, but it is definitely the best use for Rubber Weight Core. Thank you to Bey Brad for prompting this combo to be revisited and assessed a bit more carefully.
Running Mode RC
Running Mode Assembled