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Get on the equipment exchange and buy a carry handle sight with a proper forge mark (can usually be found used for $40-60) and saw it down yourself. Best option considering the price.
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This too, if you are lucky you can get the actual LMT rear for $60.
The new UTG Slim is decent enough though. I was surprised at the quality compared to a chopped down Cardinal Forge sight.
The body however is billet. While the carry handles are forged. IIRC Forged has much higher strength than billet? While I love how lightweight/low profile is, the body on the UTG might not be as robust. However the quality of steel parts seems pretty similar to a milspec sight. (Phosphated and not made out of pot metal for one.)
If it's a budget plinker, get the UTG.
If it's going to be on a serious AR get the LMT. They sell really fast on the EE so you need to be patient.
Cardinal Forge vs UTG Slim
One thing to keep an eye out for. I hear the newer LMT rear sights are cast.... The older ones were forged IIRC.
This is just my opinion but Forged>Billet>Cast