Upgrading a Glock magazine for more capacity is one of the quickest, most economical ways to increase your on-gun rounds without changing your training regimen. For shooters who want a discreet capacity boost that integrates with factory magazines, this is a straightforward hardware upgrade with clear tactical benefits.

PEARCE GRIP MAGAZINE EXTENSION replaces the original floor plate and internal locking plate on Mid and Full Size Glock high capacity magazines and adds two rounds to a 9mm, two rounds to a .40SW and .357SIG, and one round to a .45GAP magazine. Shop this product

Design and fitment

Made by Pearce Grip, a trusted aftermarket name for Glock accessories, the PEARCE GRIP MAGAZINE EXTENSION is offered in various models to match mid and full-size Glock magazine bodies. Installation is simple: remove the factory floor plate and internal locking plate, drop in the extension, and secure it in place. Because it replaces internal components rather than stacking externally, the extension maintains reliable lock-up while adding capacity.

How the extra rounds matter

Adding two rounds to a 9mm magazine is meaningful for defensive and range use — it can shift a follow-up engagement from an immediate reload to a controlled tap-rack or allow one more round in competitive stages. For .40SW and .357SIG users, two additional rounds increase sustained fire capability where recoil management and shot placement are priorities. The single-round gain for .45GAP still optimizes capacity without significantly changing balance.

At an MSRP of $7.99, this extension is an affordable upgrade that gives a measurable capability boost for the cost of a single box of ammunition. Model options (listed as Various) let you match the extension to your specific magazine generation and Glock platform.

Field considerations

Expect no major changes to draw or concealment on most duty or range setups for mid and full-size pistols, though the slight added length can affect holster fit with ultra-tight custom rigs — verify clearance if you run a molded Kydex holster. Reliability is tied to correct installation and using compatible mid/full-size magazines.

For details, parts matching, and to purchase, View product details and pricing.

Purchase and final notes

Pearce Grip’s reputation for Glock enhancements, combined with the simple swap-out installation and the clear caliber-specific capacity gains—two rounds for 9mm, two for .40SW and .357SIG, one for .45GAP—make this a practical upgrade for anyone running mid or full-size Glock magazines. Check current availability and confirm model compatibility before ordering.

Check availability

People Also Ask