Modern Sporter builds Q&A

[propliner]

I had a quick question about the dust cover. Currently it doesn’t seat tight to the upper. It sits about 1/8 away from completely closed. Is anyone else having this problem.

The cheap DPMS cover has a small gap too.

[apex survival]

I had a quick question about the dust cover. Currently it doesn’t seat tight to the upper. It sits about 1/8 away from completely closed. Is anyone else having this problem. I was thinking about going with an adjustable one from strike industries but I don’t know if this will solve the problem. Currently I have just a cheap steel one installed. On a completely different topic has anyone considered filing down the catch on the charging handle. I was thinking long term it might wear down the upper since upper is aluminum and the charging handle catch appears to be steel.

I have one of the Strike Industries ultimate covers, fits perfectly.

[TheRedViking]

whats the best way to torque a barrel nut down on the sporter? I only have a magpul bev block but it wont fit into the upper, any alternatives? preferably not having to buy another tool

[blupul]

Myself I got away with putting a rag around it and throwing in the vise , not super tight just enough to hold it while I torque . Probably not ideal way of doing it but the job got done and zero scuffing

[TheRedViking]

Myself I got away with putting a rag around it and throwing in the vise , not super tight just enough to hold it while I torque . Probably not ideal way of doing it but the job got done and zero scuffing

where do i clamp it down using this method? behind the deflector or in front of it?

[greg olmstead]

whats the best way to torque a barrel nut down on the sporter? I only have a magpul bev block but it wont fit into the upper, any alternatives? preferably not having to buy another tool

Remove the roll pin in the bev block. Slide the steel part up. Put upper on bev block. Put barrel in upper. Put pin through bev block and upper. Clamp bev block in vice tight. Torque barrel nut.

[Ntloukas]

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[jiffx2781]

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[Sqr]

I bought a Midwest Industries M-LOK G3 SSM rail that uses an anti rotation tab. Unfortunately due to the anti rotation tab it will not work with the upper.

It was bought before I received the upper. Any solutions before I buy something else?

I had the identical issue on my SLR and needed to cut the two tabs off. The billet lowers are much thicker so do not worry it will hide the modifications.

[Bombsquad68]

Had an issue doing a test fit with both spare handguards I had on hand.

They're Aero Precision's, never had issues with them in the past. These guards are for milspec AR uppers so they weren't gonna fit this build, but the nut should still thread on fine. I used Aeroshell 33 and stopped pretty quick but both barrel nuts I have here are giving me trouble and are threading slightly off. I've never seen this before, any ideas?

I've got other hand guards here but don't feel like pulling anything else apart to check with a 3rd or 4th barrel nut... I've got a different HG coming for this gun but it's a ways out yet.