colt model no           stock fire control rear sight forward assist barrel length barrel profile barrel twist             hand guards bayonet lug muzzle device
0         le1020  4th generation        s - 1    flattop            yes         16 in             m4          1:7             rail system         yes            a2
1         le1033  4th generation        s - 1    flattop            yes       11.5 in             a2          1:7             rail system         yes            a2
2         le6920  4th generation        s - 1    flattop            yes         16 in             m4          1:7                      m4         yes            a2
3       le6920hb  4th generation        s - 1    flattop            yes         16 in        m4 hbar          1:7                      m4         yes            a2
4         le6921  4th generation        s - 1    flattop            yes       14.5 in             m4          1:7                      m4         yes            a2
5      le6921cqb  4th generation        s - 1    flattop            yes       10.5 in        m4 hbar          1:7                      m4         yes            a2
6       le6921hb  4th generation        s - 1    flattop            yes       14.5 in        m4 hbar          1:7                      m4         yes            a2
7       le6921sp  4th generation        s - 1    flattop            yes         10 in        m4 hbar          1:7                      m4         yes            a2
8         le6933  4th generation        s - 1    flattop            yes       11.5 in             a2          1:7            short ribbed         yes            a2
9         le6940  4th generation        s - 1    flattop            yes         16 in             m4          1:7  monolithic rail system         yes            a2
10        le6941  4th generation        s - 1    flattop            yes         16 in             m4          1:7             rail system         yes            a2

Table as JSON:
{"colt model no":{"0":"le1020","1":"le1033","2":"le6920","3":"le6920hb","4":"le6921","5":"le6921cqb","6":"le6921hb","7":"le6921sp","8":"le6933","9":"le6940","10":"le6941"},"stock":{"0":"4th generation","1":"4th generation","2":"4th generation","3":"4th generation","4":"4th generation","5":"4th generation","6":"4th generation","7":"4th generation","8":"4th generation","9":"4th generation","10":"4th generation"},"fire control":{"0":"s - 1","1":"s - 1","2":"s - 1","3":"s - 1","4":"s - 1","5":"s - 1","6":"s - 1","7":"s - 1","8":"s - 1","9":"s - 1","10":"s - 1"},"rear sight":{"0":"flattop","1":"flattop","2":"flattop","3":"flattop","4":"flattop","5":"flattop","6":"flattop","7":"flattop","8":"flattop","9":"flattop","10":"flattop"},"forward assist":{"0":"yes","1":"yes","2":"yes","3":"yes","4":"yes","5":"yes","6":"yes","7":"yes","8":"yes","9":"yes","10":"yes"},"barrel length":{"0":"16 in","1":"11.5 in","2":"16 in","3":"16 in","4":"14.5 in","5":"10.5 in","6":"14.5 in","7":"10 in","8":"11.5 in","9":"16 in","10":"16 in"},"barrel profile":{"0":"m4","1":"a2","2":"m4","3":"m4 hbar","4":"m4","5":"m4 hbar","6":"m4 hbar","7":"m4 hbar","8":"a2","9":"m4","10":"m4"},"barrel twist":{"0":"1:7","1":"1:7","2":"1:7","3":"1:7","4":"1:7","5":"1:7","6":"1:7","7":"1:7","8":"1:7","9":"1:7","10":"1:7"},"hand guards":{"0":"rail system","1":"rail system","2":"m4","3":"m4","4":"m4","5":"m4","6":"m4","7":"m4","8":"short ribbed","9":"monolithic rail system","10":"rail system"},"bayonet lug":{"0":"yes","1":"yes","2":"yes","3":"yes","4":"yes","5":"yes","6":"yes","7":"yes","8":"yes","9":"yes","10":"yes"},"muzzle device":{"0":"a2","1":"a2","2":"a2","3":"a2","4":"a2","5":"a2","6":"a2","7":"a2","8":"a2","9":"a2","10":"a2"}}