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I installed this Spikes barrel (2A8-RTB-CHFMB-SB51606-MLG) on a Spikes upper and lower. It was an easy install, the barrel had a groove cut into it and the gas block aligned perfectly. I used a Spikes Tactical Melonited Gas Tube mid length (2A8-RGT-STMELGTB-SUGT0M3)it also aligned perfectly in the upper. I used a rise armament Nickle Boron BCG (2AL-BCG-RABCG-RA-1011-SLVR). I went to the range today to zero in my scope. I shot at 110 yards Bench rested and was able to shoot 5 round groups and cover them with a quarter. All of these items are 5 star. No feed issues or cycling issue either. Optics Planet has great offerings at good prices.
I recently purchased this tool and feel it is designed very well. The Real Avid Armorers Wrench is very easy to use. It makes working on my AR rifles a breeze. The grip size and the placement of the different tools on the wrench make it easy to get proper torque on the parts that need it. I would recommend this wrench to anyone who likes (needs) to work on their own AR firearms. A quality tool.
I used this receiver block for a recent build. It worked great for holding the upper during the barrel install and made it easy to torque the barrel nut. The upper receiver block does separate from the lower portion of the receiver block. I found it to be a versatile tool. A nice tool to add to your collection.