Wolff Extra Power Magazine Spring for Glock 19, 21, 23, 26, 27, 29, 30, 32, 33

Wolff Extra Power Magazine Springs are used when magazine reliability is critical or when original factory springs have lost their tension. These extra power springs put more pressure on the follower, presenting the cartridge to the slide with more force. For Use In:Glock 19 - 15 or 17 (with +2 extension) roundsGlock 21 - 13 rounds (+5% in Model 21, 13 round magazine. Not for Glock 21 Gen 4)Glock 23 - 10 and 13 roundsGlock 26, 27, 29 & 30 - 9 or 10 roundsGlock 21 and 33 - 10 roundsGlock 32 - 10 and 13 rounds (Law Enforcement) DISCLAIMER: This product is not manufactured, authorized, endorsed, or warranted by GLOCK. GLOCK does not warrant or represent that this product is compatible with GLOCK pistols.