Brass Stacker™ RSA for Glock™ Full Frame Pistols


Stainless Steel Captured Assembly for
G17 G17L G20 G20SF G21 G21SF G40 G41
G22 G24 G31 G37



Quality CNC machined Recoil Spring Assembly for Glock™ Full Frame pistols G17, G17L, G22, G24, G31, G37 and G20, G20SF, G21, G21SF, G40, G41

Completely assembled “drop-in” unit includes ISMI™ heat treated, shot peened and stress relieved premium chrome silicon springs. Offered in either Black or Polished exposed face. All guide rods are stainless steel and have a 100% lifetime warranty. Recoil springs have a one year replacement warranty. Both are made in America.

We offer the following:

Single Stage RSA for Full Frame Gen 1, 2 & 3 pistols feature a flat wire recoil spring, modified button head cap screw with black nylon washer. Black screws are hardened alloy steel and polished screws are stainless steel.

Single Stage (Gen 3 type) RSA for Full Frame GEN 4 pistols have the same features as above and MUST BE used with the included Gen 4 Adapter, pictured at left.  (The GEN 4 Adapter allows you to use standard single stage guide rod assemblies in GEN 4 pistols. The black oxide plated steel adapter is inserted into the slide and adaptes end ring to standard diameter.)

Hover over or click on picture at left for description.

DISCLAIMER: “GLOCK” is a federally registered trademark of Glock, Inc. and is one of many trademarks owned by Glock, Inc. or Glock Ges.mbH. Neither Brass Stacker™, nor this site are affiliated in any manner with, or otherwise endorsed by, Glock, Inc. or Glock Ges.mbH. The use of “Glock” on this page is merely to advertise the sale of Glock pistols, parts, or components.

Additional information

Weight 3 oz
Dimensions 9 × 6 × 2 in


Pistol Model


Recoil Spring Weight

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Exposed Face Finish



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