8/19/2023 0 Comments Gemtech 300 blackout subsonic ammo![]() ![]() There are two types of noise that can damage hearing: 1) short-duration, high-intensity noise, such as gunshots, and 2) prolonged exposure to lower levels of noise. Most well-engineered suppressors take the dB level of their host firearm below 140 dB, making those suppressors effective primary-hearing safety devices. Without hearing protection, exposure to any impulse noise over 140dB causes varying degrees of permanent noise-induced hearing loss. The average threshold of pain for the human ear is around 130 dB.Īccording to OSHA, the threshold for a hearing safe impulse noise is 140 dB. The smallest level of sound that can be detected by the human ear is around one dB (0.1 bel). The specification of the intensity of the sound, as ordinarily used, implies a comparison with the smallest level of sound detectable by the human ear. Sound is commonly measured in decibels (dB). Sound is the sensation that’s experienced when the brain interprets vibration within the structure of the ear caused by rapid variations in the air pressure. The suppressor was transferred to C2 Tactical in Tempe, Arizona, The polymer tip increases the ballistic coefficient of the ammo, as well as greatly enhancing terminal performance by initiating dramatic expansion upon impact. It’s outstanding ammo for suppressed applications. Gemtech provided me with a GMT-300BLK, on loan for evaluation as well as its American-made Gemtech 187GR Polymer Tip Subsonic 300BLK ammo. Gemtech GMT-300BLK features a two-piece design and Gemtech’s patented G-Core technology Cerakote is a thin ceramic finish that is withstands high temperatures and is very durable. It has a black Cerakote® finish with a reduced IR signature. It measures 7.5 inches (17.02 cm) long, 1.5 inches (3.81 cm) in diameter and weighs 14 ounces (396.89 g). When installing the GMT-300BLK, Gemtech recommends tightening the core to the barrel and then hand tightening the tube to the core.ĭesigned for short-barreled rifles (SBRs), the compact GMT-300BLK features all titanium construction to keep the weight down. You can easily remove the tube to clean the core. Another cool thing about the design is that it also makes cleaning a snap. The suppressor features the Gemtech logo on the front, with a 3/8-inch socket so you can easily torque it down. Sound reduction is 28-30dB, which is very good for a compact suppressor like the GMT-300BLK. It’s a two-piece design and features Gemtech’s patented G-Core® mono-core technology. ![]() It’s a direct thread-on suppressor, with a 5/8-24 thread. Its rated for supersonic and subsonic ammo in down to a 7.5-inch (17.02 cm) barrel. The Gemtech GMT-300BLK is a 300BLK specific sound suppressor that’s full auto rated. Gemtech Gemtech is an International Organization for Standardization (ISO) 9001:2008 certified company. The company is a founding member of the American Suppressor Association (ASA). Headquartered in Meridian, Idaho, the company was founded in 1993 and manufactures sound suppressors for rifles, pistols, submachine guns (SMGs) and personal defense weapons (PDWs), as well as accessories and ammunition. Gemini Technologies (Gemtech) is no newcomer to sound suppressor design. It full auto rated on barrels down to 7.5 inches in length and for both supersonic and subsonic loads. Gemtech GMT-300BLK was designed specifically for the 300 BLK cartridge. Supersonic loads provide ballistic performance approximating that of the 7.62×39, while subsonic loads vastly outperform the 9×19 NATOr for suppressed applications.Īlthough the 300BLK hasn’t been officially adopted by any military, it’s in use by a number of special operations forces around the globe, including the US, UK and Netherlands. The design parameters of the 300BLK make an the ideal round for shorter barrels and for suppressed applications. 300BLK for optimal performance with all cartridges. Standard 5.56 NATO magazines can also be used with the 300BLK, though I recommend a magazine specifically designed for the cartridge, such as the outstanding M agpul ® PMAG® 30 AR 300 B GEN 3 TM. The cartridge was developed to provide improved performance from the AR platform with only a barrel change, using standard bolts, and gas impingement systems. The 300BLK (7.62×35) gives you options not found in any other factory cartridge for the AR-15/M4 platform. ![]()
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