Give you a statement and table with its title in Markdown format, please determine whether the statement is supported or refuted by, or is unrelated to the table. It'a binary classification problem, you should choose the answer between supported and refuted. 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 | barrel length | barrel profile | barrel twist | hand guards | bayonet lug | muzzle device |
| le1020 | gas piston carbine | 4th generation | s - 1 | flattop | yes | 16 in | m4 | 1:7 | rail system | yes | a2 |
| le1033 | gas piston commando | 4th generation | s - 1 | flattop | yes | 11.5 in | a2 | 1:7 | rail system | yes | a2 |
| le6920hb | law enforcement carbine | 4th generation | s - 1 | flattop | yes | 16 in | m4 hbar | 1:7 | m4 | yes | a2 |
| le6921 | m4le carbine | 4th generation | s - 1 | flattop | yes | 14.5 in | m4 | 1:7 | m4 | yes | a2 |
| le6921cqb | m4le carbine | 4th generation | s - 1 | flattop | yes | 10.5 in | m4 hbar | 1:7 | m4 | yes | a2 |
| le6921hb | m4le carbine | 4th generation | s - 1 | flattop | yes | 14.5 in | m4 hbar | 1:7 | m4 | yes | a2 |
| le6921sp | m4le carbine | 4th generation | s - 1 | flattop | yes | 10 in | m4 hbar | 1:7 | m4 | yes | a2 |
| le6933 | m4le commando | 4th generation | s - 1 | flattop | yes | 11.5 in | a2 | 1:7 | short ribbed | yes | a2 |
Title:
ar - 15 variants
Statement:
all ar - 15 variants use flattop as a rear sight
Answer:
supported