Speed up your reloads with the Shield Arms Premium Magwell for the Glock 43X/48. Features: Machined from billet aluminum Type 2 anodized Contoured for increased grip when coupled with the S15 magazine and the S15 +0 base plate Made in the USA 100% Lifetime Warranty Compatibility: Fits Gen 1, Gen 2 and Gen 3 (ambi) S15 magazines; optimized for Gen 2 & 3 mags. Gen 2 mags with Gen 1 or Gen 2 plastic base plates Gen 2 mags with +0 aluminum base plates Gen 1 mags with Gen 1 plastic base plates Not compatible with some frame modifications