For 12 gauge only.
Magazine Extension 10 shot for the Remington 1100/1187. Includes barrel magazine clamps. For Remington 1187 Express, some models may require minor modification. These magazine extensions are machined from super strong chrome moly steel tubing and are guaranteed for life. Each extension includes a new spring. Installation takes only minutes. Tacstar
The 7 shot magazine extension will not extend past an 18" barrel.
The 8 shot magazine extension will not extend past a 20" barrel.
The 10 shot magazine extension will not extend past a 26" barrel.
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