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. | Name | Stock | Fire control | Rear sight | Forward assist | Case deflector | Barrel length | Barrel profile | Barrel twist | Hand guards | Bayonet Lug | Muzzle device |
| --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- |
| R6000 | AR-15 Sporter (SP1) | A1 | S-1 | A1 | No | No | 20 in. | A1 | 1:12 | Triangular | Yes | Type 2 Duckbill or A1 |
| R6001 | AR-15 Sporter Carbine (SP1 Carbine) | 2nd Generation | S-1 | A1 | No | No | 16 in. | A1 | 1:12 | Short Ribbed | Yes | A1 |
| R6002 | AR-15 Sporter (SP1; Bundled with 3x scope) | A1 | S-1 | A1 | No | No | 20 in. | A1 | 1:12 | Triangular | Yes | A1 |
| R6420 | AR-15A2 Sporter II Carbine | 3rd Generation | S-1 | A1 | Yes | No & Yes | 16 in. | A1 | 1:7 | Short Ribbed | Yes | A2 |
| R6430 | Sporter Lightweight (9mm) | A2 | S-1 | A1 | No | Removable | 16 in. | A1 | 1:10 | Short Ribbed | Yes | A1 |
| R6450 | AR-15 9mm Carbine | 3rd Generation | S-1 | A1 | No | No & Removable | 16 in. | A1 | 1:10 | Short Ribbed | Yes | A1 |
| R6500 | AR-15A2 Sporter II | A2 | S-1 | A1 | Yes | No & Yes | 20 in. | A2 | 1:7 | Ribbed | Yes | A2 |
| R6520 | AR-15A2 Government Carbine | 3rd Generation | S-1 | A2 | Yes | Yes | 16 in. | A1 | 1:7 | Short Ribbed | Yes | A2 |
| R6530 | Sporter Lightweight .223 | 3rd Generation | S-1 | A2 | Yes | Yes | 16 in. | A1 | 1:7 | Short Ribbed | No | A2 |
| R6550 | AR-15A2 Government | A2 | S-1 | A2 | Yes | Yes | 20 in. | A2 | 1:7 | Ribbed | Yes | A2 |
| R6550CC | AR-15A2 Government (w/ factory camouflage finish) | A2 | S-1 | A2 | Yes | Yes | 20 in. | A2 | 1:7 | Ribbed | Yes | A2 |
| R6551 | Sporter Target | A2 | S-1 | A2 | Yes | Yes | 20 in. | A2 | 1:7 | Ribbed | No | A2 |
| R6600 | AR-15A2 HBAR | A2 | S-1 | A2 | Yes | Yes | 20 in. | HBAR | 1:7 | Ribbed | Yes | A2 |
| R6601 | Sporter Match HBAR | A2 | S-1 | A2 | Yes | Yes | 20 in. | HBAR | 1:7 | Ribbed | No | A2 |
| R6700 | Sporter Competition HBAR | A2 | S-1 | Flattop | Yes | Yes | 20 in. | HBAR | 1:9 | Ribbed | No | A2 |
| R6721 | AR-15A3 Tactical Carbine | 4th Generation | S-1 | A2 | Yes | Yes | 16 in. | HBAR | 1:9 | Short Ribbed | Yes | A2 |
| R6724 | Sporter Competition HBAR | A2 | S-1 | Flattop | Yes | Yes | 24 in. | HBAR | 1:9 | Ribbed | No | A2 |
| R6731 | AR-15A3 Competition HBAR | A2 | S-1 | A2 | Yes | Yes | 16 in. | HBAR | 1:9 | Short Ribbed | No | A2 |
| R6750 | Sporter Competition HBAR (bundled w/ bipod) | A2 | S-1 | A2 | Yes | Yes | 20 in. | Super-Heavy | 1:7 | Ribbed | No | A2 |
| R6821 | Sporter Carbine (7.62x39mm) | 3rd Generation | S-1 | A2 | Yes | Yes | 16 in. | HBAR | 1:12 | Short Ribbed | No | A1 |
Question:
what are all the barrel lengths whith the name  ar-15a3 competition hbar
Answer:
16 in.