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Any input on buffer tube or hand guard?
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I have no knowledge of whether the slr gas block will fit, but the ALG defense EMR rails are great for the money. If you don’t know, they are a budget line of Geissele. I have one on a 300 Blk upper and it has been great.
ALG EMR V3 Black 10” for $116. They also have ddc,gray and purple with different lengths for varying prices.
https://algdefense.com/ergonomic-modular-rail-emr-v3-m-lok.html
Sorry about the cold link, I am on my cellphone.
If spending $200+ on a rail, I am putting a Geissele on it.
ETA: Buffer tubes, generally come in 6061 and 7075, don’t get too caught up in the material, just buy mil-spec diameter from a reputable manufacturer. Make sure to get a pistol brace and buffer tube that works with said brace while waiting on your form 1.