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Star Model BM

• moderate
• Shop tier 2
• medium confidence
• Pistol
• single action
• surplus
• 1911 pattern layout
• steel frame

field strip ~3 min · reassembly ~4 min · detail strip ~30 min

Specifications

Model-specific safety

• The BM follows the 1911 layout closely — single action, thumb safety, similar takedown — but it has NO grip safety and its parts are not interchangeable with a 1911. Do not order 1911 parts for it.
• The recoil spring is under tension when the slide comes off.
• The slide stop must be removed with its takedown notch aligned. Forcing it damages the frame.
• Surplus ammunition of this era is frequently corrosively primed. Clean with a water-based solvent the same day you shoot.
• Newly imported pistols are often packed in cosmoline including the firing pin channel. Clean it out and reinstall the firing pin dry — a pin held forward by congealed grease causes slam fires.

Under spring tension

• Recoil spring and guide
• Hammer spring
• Magazine spring

Easily lost parts

Slide stop · Recoil spring and guide · Barrel link

Tools

No tools required for the field strip.

Shop difficulty

Shop tier 2 Tier 2 — moderate among pistols, for the full job: strip to the parts that get coated and put it back together working. 51 parts in a 1911-like but non-interchangeable design: removable bushing and link, captive recoil spring, slide-mounted firing pin retained by a vertical pin under the rear sight, pivoting trigger with a rail-mounted disconnector and a magazine safety. A gunsmith who knew both found it harder to detail strip than a 1911.

Parts: 51 numbered parts ('Piezas componentes de la pistola STAR modelo BM' (p. 3) keyed to the 'Vista explosiva' (p. 2), Guardia Civil manual; complete pistol incl. magazine and cleaning rod.), from Pistolas automáticas Star — Nuevo modelo de pistola "Star" BM, calibre 9 mm. Parabellum (Luger). Reglamentaria en el Cuerpo de la Guardia Civil — Star Bonifacio Echeverria, S.A. (Eibar), p. 2–3 archive.org [2].

Bench time: about 30 min to strip, 45 min to rebuild (estimate). Slide (rear sight drift, firing pin retaining pin, firing pin, external extractor, bushing) and frame (grips, hammer and mainspring, sear, trigger, disconnector, magazine safety and catch, thumb safety, slide stop); rebuild longer for the sight re-centre and hammer spring.

Small parts: 0 pins, 0 springs, 0 detents or plungers (counted from the manufacturer's parts list (one per key number unless a quantity is given))

What comes off for coating

• Slide: barrel bushing, captive recoil spring and guide, rear sight (drifted to free the firing pin pin), firing pin retaining pin, firing pin and spring, extractor, pin and spring — sight pusher or brass drift, pin punches
• Frame: grips and screws, hammer, hammer spring and plunger, sear, pin and spring, trigger, pin and spring, disconnector (rail groove), magazine safety, thumb safety, plunger and spring, magazine catch, latch and spring, slide stop, ejector and pin — pin punches

Special tools

• dovetail sight pusher (or brass drift and padded vise) — Removing and refitting dovetailed sights for coating

Known pain points

• An experienced 1911 user finds the BM harder to detail strip than a true 1911. (both)
  Source: A Critical Look at the Star Model BM — Hi-Powers and Handguns (Stephen A. Camp) hipowersandhandguns.com [3] — “While the pistols are not too difficult to detail strip, I do not find them as easy as the true 1911.”
• The firing pin is retained by a vertical pin under the rear sight, so the sight has to be drifted to get the firing pin out. (both)
  Source: A Critical Look at the Star Model BM — Hi-Powers and Handguns (Stephen A. Camp) hipowersandhandguns.com [3] — “Removal of the firing pin and spring are more difficult with this pistol as the rear sight has to be moved enough to remove the vertical steel pin beneath it that retains the firing pin.”
• The captive recoil spring on its full-length guide is harder to service. (both)
  Source: A Critical Look at the Star Model BM — Hi-Powers and Handguns (Stephen A. Camp) hipowersandhandguns.com [3] — “While less like to lose a spring under field conditions, it is also more difficult to change recoil springs with this arrangement.”
• 1911 parts do not fit; parts are no longer made. (reassembly)
  Source: A Critical Look at the Star Model BM — Hi-Powers and Handguns (Stephen A. Camp) hipowersandhandguns.com [3] — “Parts do not interchange and internal systems are quite different.”

Fit or check on rebuild

• Rear sight re-centred — The rear sight is moved to free the firing pin retaining pin, so it must go back on centre
• Function check: trigger reset, sear/striker engagement, safeties — Standard post-reassembly check on any pistol whose fire-control parts were removed; a mis-seated spring shows up here, not on the bench

This is Pew-Takedown's rating, not the manufacturer's. How tiers are rated. Forum reports are owners' experience, not specifications.

Procedures

Torque specifications

No sourced torque values from the manufacturer are recorded for this firearm. Where a fastener has a specified torque — action screws, scope bases, muzzle devices, barrel nuts — get it from the manufacturer or a gunsmith rather than estimating it.

Parts list

Transcribed from the manufacturer's parts list (Pistolas automáticas Star — Nuevo modelo de pistola "Star" BM, calibre 9 mm. Parabellum (Luger). Reglamentaria en el Cuerpo de la Guardia Civil — Star Bonifacio Echeverria, S.A. (Eibar), p. 2–3 archive.org [2]) — "Piezas componentes de la pistola STAR modelo BM calibre 9 mm Parabellum (Luger)" (p. 3), keyed by part number to the "Vista explosiva" on p. 2. Only list in the manual (Guardia Civil issue edition).. Key numbers refer to the exploded view in that document.

Function check

• Verify the pistol is unloaded with no magazine inserted before each check.
• Cock the hammer, engage the thumb safety, and press the trigger. The hammer must not fall.
• Disengage the safety and press the trigger. The hammer should fall.
• Hold the trigger back, rack the slide, release slowly and confirm the reset.
• Confirm the slide locks open on an empty magazine.

Maintenance

Lubrication points

• Frame rails and slide grooves
• Barrel locking lugs and link
• Hammer and sear pivots

Cleaning notes

Surplus ammunition of this era is frequently corrosively primed. After shooting it, flush the bore, bolt face, and gas system with hot soapy water or a water-based solvent the same day, dry completely, then oil. Keep the firing pin channel clean and dry — a pin held forward by congealed cosmoline causes slam fires.

Suggested inspection interval: roughly every 1000 rounds. This is a general guideline, not a manufacturer specification.

Wear parts to inspect

Recoil spring · Extractor · Barrel link · Magazine feed lips

Common issues

Also covers

The procedures above are reported to apply to: Star BKM (alloy frame) · Star Model B and Super B (larger, with differences). Verify against the manual for your specific model.

Similar manual of arms

• M1911A1 / 1911 Government Model
• Browning Hi-Power

Sourcing