Angstadt Arms AR-15 9mm 5.4 oz Carbine Buffer Assembly w/ Carbine Buffer Spring 9mm Buffer Spacer Compatible with Both and Colt Style Magazines. It is compatible with both GLOCK and Colt style magazines. Specifications for Angstadt Arms AR-15 9mm 5.4 oz Carbine Buffer Assembly w/ Carbine Buffer Spring 9mm Buffer Spacer: Manufacturer: Angstadt Arms Color: Black Gun Make: Colt Glock Gun Model: AR-15 Additional Features: 5.4 oz Carbine Included Accessories: Carbine buffer spring9mm buffer spacer Condition: New Weight: 5.4 oz Package Contents: Angstadt Arms AR-15 9mm 5.4 oz Carbine Buffer Assembly w/ Carbine Buffer Spring 9mm Buffer Spacer What firearm models does the manufacturer say Angstadt Arms AR-15 9mm 5.4 oz Carbine Buffer Assembly w/ Carbine Buffer Spring 9mm Buffer Spacer is compatible with? The manufacturer says that Angstadt Arms AR-15 9mm 5.4 oz Carbine Buffer Assembly w/ Carbine Buffer Spring 9mm Buffer Spacer is compatible with AR-15Angstadt Arms ANGAA09BUFKIT: AR-15 9mm 5.4 oz Carbine Buffer Assembly w/ Carbine Buffer Spring 9mm Buffer Spacer Compatible with Both and Colt Style Magazines