Spro USA

Spro USA ranked #97 of 323 brands on GunPartPicker in September 2026, just behind Criterion Barrels, with about 1 in every 1000 parts builders added. Up from #112 in August. Builders reached for Spro USA mostly for buffer spring parts. The most added single part was the Sprinco USA Spring KIT- Xp Buffer Spring W/ Dual Extractor Spring Set, taking the top spot from the Sprinco USA 308 M4 Extension Tube Cs Xp Buffer Spring in Hard Tube.

Buffer springs were the busiest Spro USA category in September: 7 products came back in stock, several more than once, and demand for them rose about 43% on August. About 56% of the 25 Spro USA products we track are in stock today.

Also popular this month: Sprinco USA 308 M4 Extension Tube Cs Xp Buffer Spring in Hard Tube, Sprinco USA M16 Rifle Cs Buffer Spring Stand-Alone, Sprinco USA Spring KIT-Std Buffer & HD 5-Coil Bolt Extractor Spring and Sprinco USA M4 Carbine Reduced Power Buffer Spring.