Remington 500V - Manual (Page 25)

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2. Insert plastic buffer into muzzle cap.
3. Screw muzzle cap to barrel assembly.
4. Firmly insert barrel into outer liner assembly with slot side down (see Figure 24).
Figure 24 - Separating Barrel Assembly from Housing
Muzzle Cap
Plastic Buffer
Barrel
Assembly
Piston
Outer Liner Assembly
Figure 25 - Replacing Key Stop
Key Stop
Annular Spring
Key Stop
Figure 26 - Rotating Annular Spring to Cover Key Stop
5. Insert key stop into slot on outer liner assembly (see Figure 25).
6. Push stop towards front of tool (see Figure 25).
7. Rotate annular spring until key stop is covered (see Figure 26).