Shield Arms SA-15 Folding Pro is a premium semi auto 5.56 NATO rifle with a 16 in nitride barrel built on a patented folding lower receiver that does not require an adapter. It uses a mid length gas system with an adjustable gas block and standard 1/2x28 threading to support suppressor ready tuning. Two 30 round Magpul PMAGs and a Mountain Partisan Sling are included to make it a ready to run setup out of the box.Key Features Patented Folding Lower Receiver design with no adapter required 16 in 4150 CMV barrel with QPQ black nitride finish Mid length gas system with adjustable gas block 1/2x28 muzzle threading ALG Advanced Combat Trigger Includes (2) Magpul PMAG Gen 2 30 round magazines Includes Mountain Partisan SlingShield Arms builds firearms and components with a focus on practical innovation and durable real world design. The brand emphasizes smart engineering choices that improve handling and portability without adding unnecessary complexity. From folding receiver systems to premium component selection Shield Arms designs are intended to support reliable performance for range and training use.