17-4 PH H900 Atlas and Atlas XL Compatible Plan B Compatible Atlas XL Adapter No Overrun Black Nitride Finish (67 HRC Surface Hardness) Shims Not Included, if you would like to specifically time this, shims will be required. Note: your barrel may require a shim if the manufacturer did not put a thread relief on it.
| Finish | Gunmetal, Heat Treat, Nitride / Melonite, PVD |
|---|---|
| Threads | 1/2×28, 1/2×36, 13.5×1 LH, 5/8×24 |
| Style | Square, Taper |
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