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Last edited by Qwerty1zer; 05-30-2020 at 02:24 AM.
Watching this thread close, my set has a lot of play in it(more than any AR I've owned) and have been playing with ideas of how to fix it.
I just measured my Strike Industries front pin at 0.247" with a mitutoyo micrometer. Randon pin I had in my parts bin was 0.249"
I also took a 0.250 pin gauge and it has play in the upper receiver hole. I don't have any pin gauges bigger than .250 so cant check that.
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Last edited by jiffx2781; 05-18-2020 at 11:46 AM.
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Are you guys all using bev blocks/ reaction rods to build your receivers and barrel install? Is a vice needed?
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I’m curious now just how loose the fit is. Is it S&W M&P Sport II loose or worse? Something that maybe interesting, I changed the barrel on my Sport II to a 20” M16 barrel and the receiver doesn’t feel loose like it did with the 16”. The only idea that came to mind is the extra weight of the barrel puts more pressure on the rear takedown pin.
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Due to the location of the front takedown pin being lower than a standard AR-15. A Bev block will not fit the upper receiver.
You’re best bet is a reaction rod or the cheaper barrel torque tool from TNA. Unless you have a vice block but remember that putting too much pressure on the upper itself can cause damage if you’re placing it in a vice. This is why the barrel torque tool is your safest option.
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I used a bev block. I removed the roll pin that holds the metal barrel extension torque tool in the plastic block and slid it up until it lined up then used a 1/4" pin in the upper pin hole and bev block hole. I then clamped the bev block in the vise and it doesn't move. It still acts like it was designed to other than the back of the bev block where you push your bolt carrier over the spigot with the oring on.
My second upper I used a wheeler delta series upper vice block that has the picatinney clamp in it. Bought it from TNA for 55 dollars. I really like how it holds the upper. I think it is a very good way to hold the upper instead of 2 pin or the barrel index pin. Reaction rods are amazing for muzzle devices as it introduces no stress into the upper.
Here is the wheeler upper clamp
ht tps://www.brownells.com/gunsmith-tools-supplies/rifle-tools/bench-vise-blocks/delta-series-ar-upper-picatinny-rail-vise-block-prod126528.aspx
It works for anything with a 1913 picatinney rail and leaves absolutely no marks or indications that the upper has ever been in a clamp. It also has pins for an ar10 and ar15 upper so you can take the upper off and hold it securely for cleaning or whatever you want to do