Best new upper for a Colt Lightweight Sporter

[JellyJar]

I have an old Colt Lightweight Sporter that I bought used back in 1992. It is a good weapon but it has the old style skinny barrel that heats up with firing causing the shots to string vertically. I have thought about getting it rebarreled but I think I would prefer an all new flat top upper so I could used some new style optics.

Any suggestions as to makes or models of good new flat top uppers in .223?

 

[rcmodel]

You might ought to do some measuring on that lower before you buy anything.

Colt had a bad habit of using non-standard takedown pin hole sizes & hole spacing there for a long time on civilian AR lowers.

If it's one of those, no standard upper will fit it without resorting to a off-set front pin bushing, or screw-together off-set pin.

http://www.mapartsinc.com/productsDetail.asp?id=645

http://www.midwayusa.com/viewProduct/?productNumber=316328

I guess that's all well & good. But the chance of breaking the front pin lug hole off the lower is there if you forget and let it swing open all the way.

rc