Please read the following table in Markdown format and then answer the question according to the table. Table cells in one row are seperated by '|', and different rows are seperated by '
'.

Table:
| Colt model no. | Diemaco model | Stock | Fire control | Rear sight | Forward assist | Barrel length | Barrel profile | Barrel twist | Hand guards | Bayonet Lug | Muzzle device |
| --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- |
| 715 | C7 | A2 | S-1-F | A1 | Yes | 20 in. | A2 | 1:7 | Ribbed | Yes | A2 |
| N/A | C7FT | A2 | S-1-F | Weaver | Yes | 20 in. | A2 | 1:7 | Ribbed | Yes | A2 |
| N/A | C7A2 | Canadian 3rd Generation | S-1-F | Weaver | Yes | 20 in. | A2 | 1:7 | Ribbed | Yes | A2 |
| 750 | Colt/Diemaco LMG/LSW | A2 | S-F | A2 | Yes | 20 in. | HBAR | 1:7 | Square LMG | No | A2 |
| N/A | LSW | A2 | S-F | Weaver | Yes | 20 in. | HBAR | 1:7 | Square LMG | No | A2 |
| 725 | C8 | 3rd Generation | S-1-F | A1 | Yes | 14.5 in. | A1 | 1:7 | Short Ribbed | Yes | A2 |
| N/A | C8FT | Canadian 3rd Generation | S-1-F | Weaver | Yes | 14.5 in. | A1 | 1:7 | Short Ribbed | Yes | A2 |
| N/A | C8FTHB | Canadian 3rd Generation | S-1-F | Weaver | Yes | 14.5 in. | A2 | 1:7 | Short Ribbed | Yes | A2 |
| N/A | SFW | Canadian 3rd Generation | S-1-F | Weaver | Yes | 16 in. | SFW | 1:7 | Short Ribbed | Yes | A2 |
| N/A | C8CQB | Canadian 3rd Generation | S-1-F | Weaver | Yes | 10 in. | A2 | 1:7 | Short Ribbed | Yes | A2 |
Question:
What kind of hand guards are associated with a rear sight of A1 and stock of A2?
Answer:
Ribbed