https://gerbranddefense.com/product/sprinco-17lb-glock-2021-recoil-spring/
SPRINCO 17LB, GLOCK 20/21 RECOIL SPRING - Gerbrand Defense, LLC
recoil springsprincoglockgerbranddefense
https://www.sprinco.com/
Sprinco USA -- Recoil Solutions
Manufacturer and Supplier of recoil springs, recoil reducers, gun lubricants, and recoil buffers for firearms. We also perform various coating and gunsmithing...
sprincousarecoilsolutions
https://www.revivaldefense.com/sprinco-extractor-spring-kit
Sprinco 5-Coil Extractor Spring Kit | AR-15 Extra Power
Sprinco extra power 5-coil extractor spring upgrade kit for AR-15 bolts. Higher than OEM tension for 16 inch and shorter rifles, with a Viton O-ring.
extra powersprincocoilextractorspring
https://lsrcusa.com/products/sprinco-m4-ar-15-gas-ring-9-pack
Sprinco M4 / AR-15 Gas Ring - 9 Pack – LOW SIGNATURE RESOURCE CENTER
Gas rings are an often overlooked part when diagnosing reliability issues with an AR-15. The gas rings are an expendable part that need to be replaced...
resource centersprincogasringpack