Skip to navigation Skip to content

Your Cart

NEWSLETTER: SIGN UP & SAVE 10%

|

🚚 FREE SHIPPING ON ORDERS OVER $100

Search for:

My account
FAQ’s
Checkout

Shop
AR-15
- AR15 Lower Parts
  Bolt Catch
  
  Buffer System
  
  Castle Nut
  
  End Plate
  
  Grips
  
  Lower Receivers
  
  LPK’s
  
  Mag Catch
  
  Mag Release
  
  Safety Selectors
  
  Stocks
  
  Takedown & Pivot Pins
  
  Trigger Guard
  
  Trigger Pins
  
  Triggers
- AR15 Upper Parts
  Barrels
  
  BCG’s
  
  Charging Handles
  
  Forward Assist
  
  Gas Blocks/Tubes
  
  Gas Blocks
  
  Gas Tubes
  
  Handguards & Attachments
  
  Hand Stop
  
  Handguards
  
  Handguard Accessories
  
  Vertical Foregrip
  
  Muzzle Devices
  
  Port Door
  
  Upper Receivers
Ammo
Guns
- Handguns
- Receivers
- Revolvers
- Rifles
- Shotguns
- Other Firearms
Magazines
Optics
Brands
Clearance
Transfers
Deals

Shop
AR-15
- AR15 Lower Parts
  Bolt Catch
  
  Buffer System
  
  Castle Nut
  
  End Plate
  
  Grips
  
  Lower Receivers
  
  LPK’s
  
  Mag Catch
  
  Mag Release
  
  Safety Selectors
  
  Stocks
  
  Takedown & Pivot Pins
  
  Trigger Guard
  
  Trigger Pins
  
  Triggers
- AR15 Upper Parts
  Barrels
  
  BCG’s
  
  Charging Handles
  
  Forward Assist
  
  Gas Blocks/Tubes
  
  Gas Blocks
  
  Gas Tubes
  
  Handguards & Attachments
  
  Hand Stop
  
  Handguards
  
  Handguard Accessories
  
  Vertical Foregrip
  
  Muzzle Devices
  
  Port Door
  
  Upper Receivers
Ammo
Guns
- Handguns
- Receivers
- Revolvers
- Rifles
- Shotguns
- Other Firearms
Magazines
Optics
Brands
Clearance
Transfers
Deals

My Account
FAQs
Checkout

FOLLOW US

RUGER SR1911 9MM 10RD BLK

RUGER SR1911 9MM 10RD BLK $42.95

Aero Melonite Gas Tubes

Aero Melonite Gas Tubes $14.99 – $17.99Price range: $14.99 through $17.99

SLR Glock 21 Mag Extension

$47.99

SLR Glock 21 Mag Extension quantity

Free shipping on all orders over $100

1% Back on all orders
Log in to account for Member Pricing

Description

- Glock 21 Mag Extension
- +4 Capacity
- 6061 T6 Aluminum
- Black Anodized
Must use Extended Spring

Extended Spring can be purchased at the link below:

https://ar15safespace.com/shop/slr-glock-21-extended-mag-spring/

SKU: GL21-MAG EXT-21 Categories: Handgun Magazines, Mag Extension, Magazine, Sale Brand: SLR Rifleworks

Related products

Out of stock

TRIJICON

Trijicon AccuPower 1-4×24 MOA Green Riflescope 30mm Tube
~~$639.99~~ $563.19 RESTOCK ALERT
Out of stock

NOVESKE

Noveske Gen 1 Stripped Upper M4
$120.00 RESTOCK ALERT
Out of stock

TRIJICON

Trijicon AccuPower 1-4×24 Riflescope MIL-Square Crosshair With Green LED 3
~~$639.99~~ $563.19 RESTOCK ALERT
GRIFFIN ARMAMENT

Griffin Armament M2 Sight
Price range: $79.95 through $195.95 Select options This product has multiple variants. The options may be chosen on the product page

AR15 Safe Space LLC

Secure your gear with confidence. Dedicated to quality, service, and your 2A rights.

Quick Links

Customer Help
Contact Us
Brands
Shipping & Returns
Newsletter
Military & First Responders Discount

Follow Us

Join the Safe Space

SUBSCRIBE & SAVE 10% OFF

© AR15 Safe Space LLC. All rights reserved.

ARE YOU AT LEAST 18 YEARS OLD?

Remember me for 365 days

THIS SITE CONTAINS RESTRICTED CONTENT. ACCESS IS PERMITTED FOR ADULTS AGED 18 AND OVER ONLY.