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NSPEC Innovations carries firearm parts for a wide range of platforms and use cases, from forced reset triggers for AR-15, AK, and Kriss Vector builds to muzzle devices, stabilizing braces, HK parts, Mosin Nagant parts, and shotgun components. Whether you're upgrading a specific part, sourcing a hard-to-find component, or building out a new configuration from scratch, browse by category below or use the filters to narrow down exactly what you need.

Firearm Parts by Category

Forced Reset Triggers

Forced reset triggers are one of the most searched and most misunderstood components in the market today. An FRT uses the firearm's cycling action to drive the trigger forward to reset after each shot, while still requiring a separate pull for every round fired. NSPEC carries FRTs across multiple platforms, including the AR-15 Super Safety FRT, the straight flat-face variant, the Ambidextrous Super Selektor, the AK FRT, the Kriss Vector FRT, and the Taurus TX22 FRT. Because classification and legality vary by device and jurisdiction, always verify your state's laws before purchasing. See our FRT buyer's guide for a full breakdown of what to check before you order.

Kriss Vector Parts

The Kriss Vector is a distinctive delayed-blowback platform chambered in pistol calibers, most commonly 9mm and .45 ACP, prized for its low felt recoil and compact profile. Sourcing parts for the Vector can be challenging since it uses a proprietary operating system with very few cross-compatible components from other platforms. NSPEC's Kriss Vector parts selection covers the hard-to-find components that Vector owners frequently need, including the platform-specific FRT for those who want to explore trigger upgrades on this host.

Stabilizing Braces

Stabilizing braces are designed to attach to a pistol buffer tube and provide a more stable shooting position without the NFA classification requirements that come with a shoulder stock on a pistol-configuration firearm. NSPEC carries stabilizing braces for AR-platform pistol builds in multiple configurations and colors, including adjustable options that work across a range of buffer tube lengths. Regulatory status for braces has shifted over recent years, so confirm current rules before purchasing if compliance is a concern for your specific build.

Muzzle Devices

The right muzzle device affects recoil management, muzzle rise, and flash signature in ways that are immediately noticeable at the range. NSPEC's muzzle device selection spans the most common thread pitches across rifle and pistol platforms: 1/2x28 for 5.56/.223/.22LR, 5/8x24 for .308 and larger rifle calibers, 1/2x36 for pistol-caliber carbines, 14x1 LH and M13.5x1 LH for AK-pattern rifles, and M24x1.5 RH and .578x28 for suppressor-host configurations. Compensators, flash hiders, and breacher-style devices are available across thread pitches, with options in both standard and Cerakote finishes from Vigilance Innovations.

HK Parts

Heckler & Koch firearms are built to tight tolerances, and genuine or spec-correct replacement parts can be difficult to source. NSPEC's HK parts selection targets the components most frequently needed by HK owners for maintenance, repair, and configuration changes. Whether you're running an HK pistol or a rifle-pattern host, having the right part on hand matters when standard retail channels don't carry what you need.

Mosin Nagant Parts

The Mosin Nagant is one of the most widely owned military surplus rifles in the United States, and replacement parts for worn or damaged components can be surprisingly difficult to track down outside of surplus channels. NSPEC stocks Mosin Nagant parts for collectors, shooters, and those working to restore rifles to serviceable condition. Parts availability varies, so check current stock for the specific components you need.

Shotgun Parts

Whether you're running a home defense setup, a hunting configuration, or a competition build, shotgun components wear differently than rifle parts and often need replacing on a different maintenance schedule. NSPEC's shotgun parts selection covers replacement components and upgrades for common pump and semi-auto platforms. Use the filters on the category page to narrow by platform or part type.

What to Know Before You Buy Firearm Parts

Unlike AR or AK platform parts where the component categories are largely standardized, the firearm parts in this section span multiple operating systems, calibers, and legal classifications. A few things worth understanding before you order.

Platform compatibility is not assumed. Parts in this section are almost never cross-compatible between firearm families. A Kriss Vector component shares nothing with an AK or AR part, and HK parts are similarly platform-specific. Always confirm the exact model and generation of your host firearm before purchasing, since even within a single manufacturer's lineup, tolerances and specifications can vary between generations.

Muzzle device thread pitch must match your barrel. Threading a muzzle device onto the wrong pitch can damage both the device and the barrel crown, and in some cases create a dangerous misalignment. Confirm your barrel's thread pitch before ordering. If you're unsure, the caliber alone is not enough information since the same caliber can come threaded to multiple pitch specifications depending on the manufacturer and platform.

Forced reset triggers carry additional research requirements. FRTs are classified and regulated differently from standard trigger components. Before purchasing, confirm the current federal posture on the specific model you're evaluating, and verify that your state does not ban the device under a "rate-of-fire," "multiburst," or machine gun definition. See the FRT buyer's guide for a step-by-step verification workflow.

Stabilizing brace rules have changed. The regulatory status of pistol braces has shifted multiple times in recent years through ATF rulemaking and subsequent court actions. Confirm the current enforceable status of the specific brace you're evaluating before placing an order. NSPEC recommends consulting current ATF guidance and any applicable court orders rather than relying on older product listings or forum discussions for compliance information.

No FFL is required for most parts. Components like muzzle devices, triggers, handguards, braces, and most replacement parts ship directly to your door without an FFL transfer. The only component that legally qualifies as a firearm and requires FFL processing is a serialized receiver or frame. If you have questions about whether a specific part requires an FFL, contact us before ordering.

Frequently Asked Questions

  • What platforms do NSPEC's firearm parts cover?

    The Firearm Parts category covers components outside of the dedicated AR-15, AR-10, AR-9, AK, and pistol sections. That includes forced reset triggers for AR, AK, Kriss Vector, and rimfire hosts; Kriss Vector-specific parts; stabilizing braces for pistol-configuration builds; muzzle devices across multiple thread pitches and calibers; HK replacement parts; Mosin Nagant components; and shotgun parts. If you're looking for AR or AK platform parts specifically, those are organized under their own dedicated categories.

  • Do I need an FFL to purchase parts from this category?

    No FFL is required for the vast majority of parts in this section. Muzzle devices, triggers, braces, and replacement components ship directly to your door. The only parts that legally require an FFL transfer are serialized receivers or frames, and none of the products in this category carry a serial number or qualify as a firearm by themselves. If you have a question about a specific item, contact NSPEC before ordering.

  • Are forced reset triggers legal to buy?

    Legality depends on the specific device and your location. Federally, classification turns on how the trigger functions per "single function of the trigger" under 26 U.S.C. § 5845(b), and ATF has issued device-specific determinations rather than a blanket ruling on all FRTs. State laws add another layer: some states ban rate-of-fire accessories under definitions broad enough to cover FRTs regardless of federal posture. Review the FRT buyer's guide and verify both federal and state status for the exact model you're considering before placing an order.

  • What muzzle device thread pitch do I need?

    Thread pitch is determined by your barrel, not your caliber. Common AR-15 barrels in .223/5.56 and .22LR use 1/2x28. Most .308 and larger rifle-caliber barrels use 5/8x24. Pistol-caliber carbines in 9mm frequently use 1/2x28 or 1/2x36 depending on the manufacturer. AK-pattern rifles typically use 14x1 LH (AKM/AK-47) or M14x1 LH (AK-74). Suppressor-ready hosts may use .578x28 or M13.5x1 LH. If you're unsure of your barrel's threading, check the barrel manufacturer's spec sheet or measure the existing threads before ordering.

  • What is the difference between a compensator and a flash hider?

    A compensator is designed primarily to redirect propellant gases to counteract muzzle rise and reduce felt recoil, which improves follow-up shot speed and keeps the sights on target. A flash hider disperses the burning gases exiting the muzzle to reduce the visible flash signature, which is especially useful in low-light conditions where a bright muzzle flash can compromise your vision. Some devices combine both functions and are marketed as flash compensators or hybrid muzzle brakes. The right choice depends on your priorities: competition and range shooters often prefer compensators, while defensive and tactical shooters may prioritize flash suppression.

  • What is the difference between a stabilizing brace and a stock?

    A stock is a shoulder device designed to be fired from the shoulder and is subject to NFA short-barreled rifle regulations when installed on a pistol-configuration firearm with a barrel under 16 inches. A stabilizing brace was originally designed to be strapped to the shooter's forearm to provide a stable one-handed firing grip, which kept it outside the NFA definition of a stock. The regulatory line between the two has been subject to ongoing ATF rulemaking and court challenges. Confirm current enforceable guidance before purchasing or installing a brace on a pistol build.

  • Are Kriss Vector parts hard to find?

    Yes. The Kriss Vector uses a proprietary delayed-blowback operating system with very little parts commonality to other platforms, which limits aftermarket support compared to AR or AK pattern rifles. NSPEC specifically stocks hard-to-find Vector components because standard retail channels often do not carry them. Check current inventory on the Kriss Vector parts page for available stock, and contact NSPEC if you're looking for a specific part that isn't listed.

  • Does NSPEC ship firearm parts to all states?

    NSPEC ships most parts to all states, but certain products, including forced reset triggers, are restricted from shipment to specific states based on local laws. Product pages for restricted items will note applicable state restrictions. If you have a question about whether a part ships to your location, review the product listing or contact NSPEC before ordering. See the full shipping and returns policy for additional details.

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