Description
These are bottom rail sections of the Knights Armament Company M4 rail system. The bottom section requires the upper section, which is sold separately. The rail mounts accessories to the rifle solidly and reliably.
US Military clothing in general runs in BDU sizing. If you are unsure about your proper size for clothing this chart will help you find your general size across all clothing, unless otherwise noted in the description.
Shirts
Pants
Shirts
| Size | Chest | Height | Sleeve |
| XSR | 29-32 | 67-71 | 24 1/4 |
| SS | 33-36 | 63-67 | 23 3/4 |
| SR | 33-36 | 67-71 | 24 3/4 |
| SL | 33-36 | 71-75 | 25 3/4 |
| MS | 37-40 | 63-67 | 24 1/4 |
| MR | 37-40 | 67-71 | 25 1/4 |
| ML | 37-40 | 71-75 | 26 1/4 |
| LS | 41-44 | 63-67 | 24 3/4 |
| LR | 41-44 | 67-71 | 25 3/4 |
| LL | 41-44 | 71-75 | 26 3/4 |
| XLR | 45-48 | 67-71 | 26 1/4 |
| XLL | 45-48 | 71-75 | 27 1/4 |
| XXLR | 49-52 | 67-71 | 26 3/4 |
| XXLL | 49-52 | 71-75 | 27 3/4 |
| 3XLR | 53-56 | 67-71 | 27 1/4 |
| 3XLL | 53-56 | 71-75 | 28 1/4 |
| 4XLR | 57-60 | 67-71 | 27 3/4 |
Pants
| Size | Waist | Inseam |
| XSR | 23-27 | 29 1/2 - 32 1/2 |
| SS | 27-31 | 26 1/2 - 29 1/2 |
| SR | 27-31 | 29 1/2 - 32 1/2 |
| SL | 27-31 | 32 1/2 - 35 1/2 |
| MS | 31-35 | 26 1/2 - 29 1/2 |
| MR | 31-35 | 29 1/2 - 32 1/2 |
| ML | 31-35 | 32 1/2 - 35 1/2 |
| LS | 35-39 | 26 1/2 - 29 1/2 |
| LR | 35-39 | 29 1/2 - 32 1/2 |
| LL | 35-39 | 32 1/2 - 35 1/2 |
| XLR | 39-43 | 29 1/2 - 32 1/2 |
| XLL | 39-43 | 32 1/2 - 35 1/2 |
| XXLR | 43-47 | 29 1/2 - 32 1/2 |
| XXLL | 43-47 | 32 1/2 - 35 1/2 |
| 3XLR | 47-51 | 29 1/2 - 32 1/2 |
| 3XLL | 47-51 | 32 1/2 - 35 1/2 |
| 4XLR | 51-55 | 29 1/2 - 32 1/2 |
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