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Ibanez built the GSRM20BWK as part of the miKro Series, a short-scale bass line positioned for players requiring a reduced-length instrument. The model carried a 726mm (28.6") scale length, placing it in the short-scale category within the broader GSR family.
The GSRM20BWK was constructed with a poplar body and a maple neck bearing the GSRM4 profile. The jatoba fretboard featured white dot inlays and medium frets, with a 305mm radius and a nut width of 38mm tapering to 58.5mm at the 22nd fret. Neck thickness measured 21mm at the first fret and 22mm at the twelfth. Electronics consisted of a passive Dynamix P pickup at the neck position and a passive Dynamix J pickup at the bridge, a split/single-coil configuration typical of PJ-style basses. The B10 bridge provided 19mm string spacing, and all hardware was finished in black.
Owners sourcing replacement parts should note that the PJ pickup configuration, 19mm string spacing, and standard bridge dimensions are shared with a wide range of production basses, which broadens compatibility options. For setup adjustments, intonation work, or hardware replacement, consulting a qualified guitar technician is recommended.
Nothing in The Vault is for sale. These records exist so the instruments stay documented after the manufacturer moves on — and the most useful part of that record is what owners add to it.
The catalog shot showed one finish, under one light, a long time ago. Yours has been played. Photos from owners are what the next person finds when they are trying to identify a part, match a finish, or work out whether the one they just bought is really what the seller said it was.
Specs only go so far. What actually fits, what breaks first, what the factory got right and what everyone ends up changing — that lives with the people who own them, not in a datasheet. Post what you know and it stays on this page for whoever comes looking next.
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From spec questions to full builds — players who have lived this gear since 2007.
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