Improvised and Country-Made Firearms: Katta, Paltik, Ghost Guns

The katta (also rendered kata, country-made pistol, or pipe gun) is the generic term in North India for a single-shot or break-open improvised firearm, typically chambered for a .315 rifle cartridge or a .12-bore shotgun shell, though barrels are commonly rechambered or manufactured in non-standard dimensions that will accept .303 British, 7.62x39mm, or whatever military surplus ammunition is cheapest in the local market at the time of manufacture. The basic design is simple: a metal pipe serves as the barrel and chamber, a rod or rod assembly serves as the firing pin, and a simple spring-loaded mechanism discharges the pin when the user releases the rod.

Munger district in Bihar has been documented as the primary production centre for these weapons since at least the 1970s. Multiple forensic and police studies, including a 2010 analysis by the Central Bureau of Investigation that accompanied a series of raids on Munger workshops, estimated that tens of thousands of such weapons were produced annually in the district, feeding criminal markets across Bihar, Uttar Pradesh, Jharkhand, and as far as Rajasthan and Delhi. Post-raid workshop inventories documented metal lathes, pipe-bending jigs, and improvised reaming tools used to cut primitive rifling into barrel tubes. A 2018 survey by the National Crime Records Bureau attributed a significant fraction of Bihar's firearms-related crimes to country-made weapons, with several CFSL Patna ballistics examination reports citing katta evidence from specific murders.

The desi tamancha (literally "local pistol") is a more elaborate variant, typically semi-automatic or with a manually cycled repeating action, produced by more skilled workshops capable of machining a barrel block, a slide or bolt assembly, and a magazine or multi-chamber cylinder. These are typically .32 ACP calibre or an improvised analogue, and they may have a partially cut rifling pattern produced by hand or by a simple single-point lathe. The quality of rifling in these weapons is highly variable: some produce consistent striation marks sufficient for comparison, others produce irregular, inconsistent marks from one shot to the next.

The paltik is the generic term for improvised and locally manufactured firearms in the Philippines, covering a wide range of designs from crude single-shot pipe guns to surprisingly functional revolvers and semi-automatic pistols produced by skilled gunsmiths in Danao City and surrounding areas in Cebu province. The legal side of Danao's manufacturing history is substantial: at various periods since the 1970s, the Philippine government licenced certain workshops to produce firearms for domestic law enforcement and for export to the US market; brand names prominent in Philippine export history include Squires Bingham and Armscor, both of which are associated with the Marikina-based Arms Corporation of the Philippines (founded as Squires Bingham Manufacturing Inc. in the 1950s) rather than with Danao cottage workshops. The illicit side has run in parallel, producing unmarked or fraudulently marked weapons for domestic criminal markets and for export across Southeast Asia and the Pacific.

A paltik produced by a skilled Danao gunsmith may be externally indistinguishable from a commercial revolver, with functional double-action lockwork, a machined cylinder, and rifled barrel. The forensic distinction lies in the manufacturing signatures. Factory-rifled barrels are produced by broaching, button, or hammer-forging processes that leave consistent, high-quality striation patterns. Paltik barrels are cut on hand-operated lathes or by rudimentary single-point cutters, producing variable groove dimensions, irregular twist rates, and surface texture that is distinctive under the comparison microscope. When a fired bullet is recovered from a paltik-related shooting, a CFSL or police laboratory examiner can often determine from the bullet's striation pattern alone that it was fired from a non-factory barrel, even before the weapon is recovered.

The Philippine National Police Crime Laboratory (PNP-CL) has published examination protocols for paltik weapons that address this manufacturing-signature problem directly. Because paltik barrels produce inconsistent striation marks, the PNP-CL protocols require test-firing multiple rounds (typically five) from the same weapon and examining the consistency of striation patterns across the test series before attempting any comparison with crime-scene evidence. INTERPOL's Firearms Reference Table includes paltik as a documented weapon category with characteristic manufacturing signatures.

The November 2008 Mumbai attacks (26/11) resulted in the recovery of AKM assault rifles, handguns, and grenades from the attack sites, supplemented by forensic examination of fired cartridge cases, bullets, and unfired rounds found at multiple locations. The AKM rifles used in the attacks were identified by CFSL Maharashtra as 7.62x39mm calibre weapons, with the rifling characteristics (4 grooves, right-hand twist) consistent with Soviet and Eastern Bloc AKM production. The examination of fired bullets from the attack sites was used in the trial before the Special Court under the Maharashtra Control of Organised Crime Act 1999 (MCOCA) that convicted Ajmal Kasab in May 2010. Forensic evidence from CFSL Mumbai was admitted under Section 293 of the Code of Criminal Procedure 1973 (the provision allowing CFSL examination reports to be tendered as evidence without the examiner necessarily appearing in person, though in the Kasab trial the examining officers did provide oral testimony).

The recovery of locally procured weapons alongside the imported military-grade rifles illustrated the mixed-source character of large-scale criminal operations. While the main tactical weapons were factory-produced and imported, planning and reconnaissance phases of the operation had involved Indian contacts who relied partly on country-made weapons from the local market. The presence of both categories in the same evidentiary record required the examining laboratory to apply distinct protocols: NIBIN-compatible comparison for the factory-produced AKM evidence, and a manufacturing-signature analysis for any country-made weapons recovered.

In the context of the Sanjay Dutt case (arising from the 1993 Bombay bombings), the weapons at issue were an AK-56 assault rifle and related ammunition. The CFSL examination of that weapon was tendered as evidence in the proceedings before the Designated TADA (Terrorist and Disruptive Activities Prevention Act) Court, contributing to the conviction on the charge of possessing a prohibited firearm (an unlicensed AK-56 being a Prohibited Bore weapon under the Arms Act 1959). The conviction was upheld by the Supreme Court in 2013 (State of Maharashtra v. Sanjay Dutt, (2013) 14 SCC 653). This case demonstrates that CFSL ballistics examination reports have been accepted at the appellate level in India's highest court.

In the United States, the definition of a firearm under the Gun Control Act 1968 (18 USC 921) includes a firearm frame or receiver. A complete frame or receiver requires a Federal Firearms Licence (FFL) dealer to serialize it and maintain transfer records. The ghost-gun industry emerged from a legal interpretation that an 80% lower receiver, a commercially sold aluminium or polymer block machined to 80% completion but requiring a buyer to drill the final holes to make it functional, was not a firearm under 18 USC 921(a)(3) and therefore did not require serialisation or an FFL transfer. Between roughly 2012 and 2022, companies including Polymer80 sold millions of 80% lower kits that, when completed by the buyer with a home drill press or drill template, became functional AR-15 or Glock-pattern receivers.

The ATF estimated in 2021 that approximately 19,344 privately made firearms had been reported to it by law enforcement in connection with criminal investigations in the prior year, and that the number had increased tenfold over the prior five years. In April 2022, the ATF issued a final rule (87 FR 24652) revising the regulatory definition of "frame or receiver" and "firearm" to include 80% lowers sold with conversion jigs, requiring manufacturers and dealers of these kits to serialize and record their sales. The rule was challenged in Vanderstok v. Garland, which reached the Supreme Court as Bondi v. VanDerStok (2024). The Supreme Court in its March 2025 decision upheld the ATF's authority to classify weapon-parts kits as firearms under the GCA, rejecting the argument that an 80% lower was categorically excluded from the GCA's definition.

For the forensic laboratory, a ghost gun presents a specific trace challenge and a specific examination challenge. Trace challenge: there is no manufacturer record, no FFL dealer transfer record, and no serial number to query against ATF eTrace or NIBIN. Even after the 2022 rule, weapons produced from pre-rule 80% lowers remained in circulation without serial numbers, and those produced from the 3D-printed receiver category (see the following topic on 3D-printed firearms) were never covered by the commercial-kit rule at all. In United States v. Avitabile (SDNY, 2014, an early ghost-gun prosecution before the 2022 rule), the prosecution established constructive possession of a completed ghost-gun receiver through cell-phone records linking the defendant to purchase of the 80% kit, rather than through ballistic trace evidence, illustrating the challenge when the firearm itself carries no identifying mark.

Examination challenge: a completed Polymer80 or similar ghost-gun receiver fitted with factory-produced internal components (barrel, trigger group) will fire evidence (fired bullets, cartridge cases) that is comparable in quality to that produced by a factory Glock. The barrel, if it is a factory-produced Glock-compatible barrel, will carry the rifling of that barrel manufacturer. The cartridge-case impressions from the firing pin, breech face, and extractor will be characteristic of those specific components. The ghost-gun traceability gap affects the investigation upstream of the laboratory; the ballistic comparison analysis itself is not different in methodology from any other Glock-family casework.

Factory barrel rifling is produced by one of three methods: cut rifling (a single broach tool is drawn through the bore repeatedly, removing metal on each pass), button rifling (a carbide button is forced through the bore under pressure, cold-working the metal), and hammer forging (the barrel blank is formed around a mandrel with the negative of the rifling, with multiple hammer blows forming the rifling in a single pass). Each method produces characteristic surface finishes and dimensional consistencies. Button-rifled barrels from the same manufacturer and calibre typically produce rifling with consistent land widths across production runs, limited only by button wear, which introduces the sub-class characteristic problem discussed in the tool marks section. Hammer-forged barrels from manufacturers such as Heckler and Koch (MP5, HK33) and Steyr (AUG) produce extremely hard, dimensionally precise barrels with characteristic surface textures that are distinctive under the comparison microscope.

A hand-cut or hand-reamed improvised barrel typically shows variable land widths (because the cutting tool or reamer is not held perfectly parallel to the bore axis throughout the operation), chatter marks from tool vibration, burrs at the twist entry and exit points, and gross dimensional irregularities compared to factory specifications. These features produce three distinct effects on fired evidence. First, the bullet may emerge with a combination of well-defined striation marks in some sectors of the bearing surface and smeared or indistinct marks in others, corresponding to portions of the barrel where the rifling was cut cleanly versus portions where the tool chattered or skipped. Second, consecutive firings from the same improvised barrel may produce less consistent striation patterns than would be expected from a factory barrel, because soft metal in the bore is deformed by each firing in a less predictable way. Third, the gross class characteristics (land count, groove width, twist direction) of an improvised barrel may not match any category in standard General Rifling Characteristics databases, making the examiner's job of characterising the weapon type harder.

In the Indian CFSL system, this recognition is embedded in the examination protocols: when a bullet bearing irregular striation marks is received, examiners classify it as "possibly fired from an improvised or country-made firearm" and document that classification in the preliminary examination report before any comparison analysis proceeds. This classification does not require a recovered weapon; it is made from the fired-bullet evidence alone and can guide the investigation toward the country-made weapon sector.