Sig Sauer MCX Rattler Firearms
Showing all 2 resultsSorted by popularity
SIG Sauer MCX Rattler Firearms
The SIG Rattler LT is the compact MCX. Same short-stroke piston and fully ambidextrous MCX controls, built around a much shorter barrel so the gun stays small without becoming a different platform. The rail is optic-ready. A factory optic is not installed. SIG fits a QD flash hider meant for SIG SLX and SLH suppressors; that is not a claim that every can mounts. These firearms ship to a licensed FFL.
The firearms listed here are MCX-Rattler LT pistols. Rattler LT keeps the compact role of the original Rattler and uses the later MCX LT layout, with fully ambidextrous controls and interchangeable LT barrels and handguards. These pistols are not MCX SPEAR LT firearms. SPEAR LT uses the same LT architecture in longer, more general-purpose barrel lengths.
Rattler, Rattler LT, and SPEAR LT
The original MCX Rattler is the ultra-short branch of the family, most often associated with a 5.5-inc .00 Blackout barrel. MCX-Rattler LT is the updated compact version. Factory Rattler LT barrels are 6.75 inches in. .00 Blackout and 7.75 inches in 5.56 NATO and 7.62×39. LT barrels and handguards are not a drop-in match for original non-LT Rattler uppers.
MCX SPEAR LT shares the short-stroke piston, ambidextrous controls, and M-LOK handguards, but it is the broader lineup with 9-inch, 11.5-inch, and 16-inch options. Choose a SIG Rattler when the short package is the point. Choose SPEAR LT when you want more barrel length on the same LT platform. The SIG Sauer MCX collection and the MCX SPEAR LT collection are the right next stops for those longer configurations.
Compact Rattler LT Pistols
The SIG Sauer MCX-Rattler LT 5.56 NATO pistol uses a 7.75-inch cold-hammer-forged barrel, a folding SIG PCB brace, an aluminum M-LOK handguard, and one 30-round polymer magazine. Model PMCX-556N-7B-LT-PCB is a pistol, not an SBR.
The SIG Sauer MCX-Rattler LT 7.62×39 pistol keeps the same 7.75-inch compact length with a 28-round steel magazine. Model PMCX-762R-7B-LT does not include a factory brace or stock. It is also a pistol, not an SBR.
Neither listing is a 300 Blackout Rattler or a factory short-barreled rifle. Caliber, magazine, and whether a folding PCB brace is included are the practical differences between these two pistols. If you want a 300 Blackout Rattler LT or a factory SBR, match the exact model number rather than the family name alone.
How to Choose a SIG Rattler
Choose 5.56 NATO if you want common AR-15 magazines and the folding PCB brace already installed. Choose 7.62×39 if you want that cartridge in the same compact LT pistol, with a 28-round steel magazine and no factory brace. Both use a short-stroke piston, an adjustable gas system for suppressed or unsuppressed use, a SIG QD suppressor-ready flash hider, and a SIG Flat Blade Match trigger. A suppressor is not included.
Both pistols are optic-ready on the M1913 top rail. A compatible optic is a separate purchase, and iron sights are not part of these factory packages. The 5.56 NATO pistol feeds from a 30-round polymer AR-15 magazine. The 7.62×39 pistol feeds from a 28-round steel magazine made for that cartridge. Those magazines are not interchangeable across calibers.
Rattler LT barrels and handguards interchange with other MCX LT components. They do not fit original non-LT Rattler uppers. A factory pistol remains a pistol in the configuration shown on the product page.
Firearms must ship to a licensed FFL dealer. Confirm federal, state, and local laws before ordering, including magazine-capacity limits. A short-barreled rifle is a different, NFA-regulated product with its own transfer process.
Frequently Asked Questions
What is a SIG Rattler?
A SIG Rattler is the compact branch of the SIG Sauer MCX family. It is a short, piston-driven firearm built for rifle-caliber performance in a smaller package than a standard MCX or MCX SPEAR LT.
Is the MCX Rattler the same as the Rattler LT?
No. The original MCX Rattler is the ultra-short version, most often associated with a 5.5-inc .00 Blackout barrel. MCX-Rattler LT is the later compact model, with 6.75-inch or 7.75-inch barrels depending on caliber, fully ambidextrous controls, and interchangeable LT barrels and handguards. The two pistols listed here are Rattler LT models, not original Rattlers.
Are these SIG Rattler models SBRs?
No. The two firearms listed here are factory pistols. The 5.56 NATO model includes a folding SIG PCB brace. The 7.62×39 model includes no factory brace or stock. A short-barreled rifle is a different, NFA-regulated configuration.
How is a SIG Rattler different from an MCX SPEAR LT?
Both use the MCX LT architecture, a short-stroke piston, and ambidextrous controls. The Rattler is the compact size, with 6.75-inch or 7.75-inch barrels. SPEAR LT is the broader, longer-barreled lineup, commonly in 9-inch, 11.5-inch, and 16-inch configurations. Browse the MCX SPEAR LT collection for those longer options.
Does the SIG Rattler come in 300 Blackout?
SIG catalogs MCX-Rattler LT firearms in 300 Blackout, typically with a 6.75-inch barrel. The two pistols listed here are 5.56 NATO and 7.62×39, not 300 Blackout. A 300 Blackout Rattler LT is a separate configuration.
Does every Rattler LT pistol include a brace?
No. The 5.56 NATO pistol, model PMCX-556N-7B-LT-PCB, includes a folding SIG PCB brace. The 7.62×39 pistol, model PMCX-762R-7B-LT, does not include a factory brace or stock. Check the exact model number before ordering.
What magazine does the 7.62×39 Rattler LT use?
The 7.62×39 pistol includes one 28-round steel magazine made for that cartridge. It is not a 5.56 NATO magazine. The 5.56 NATO pistol includes one 30-round polymer AR-15 magazine.
Do SIG Rattler firearms have to ship to an FFL?
Yes. These are firearms and must ship to a licensed FFL dealer. Confirm federal, state, and local laws before ordering, including magazine-capacity limits. NFA-regulated short-barreled rifles require a separate transfer and approval process.