AR Sponsor
Posted: 1/23/2014 5:49:32 AM EDT
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I'm putting together a pistol from scratch, and as I have built a couple of my own ARs in the past, I am a little concerned about what parts might be specialized just for the pistol. I've already collected a 7.5" barrel and a pistol buffer tube assembly, so I just had a few questions about other parts
What forearm would be a good choice, inexpensive but reliable, with rails? Pigtail or no pigtail gas tube? Seems like the pigtails I have seen online are about 4-5 times as expensive as a regular tube. Gas block options? Should I go adjustable if I ever decide to put a can on it? OK to go with other normal AR parts like BCG and stripped upper receiver? TIA! |
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This is what I have learned from my own experience.
Adjustable gas blocks are not totally needed - By the end of the day I think I am running it 100% open anyway. (I don't plan on running suppressed ever). But that depends on buffer weight. Be prepared to maybe swap buffers. It also depends more on the specific gas port size of that barrel manufacture. If you want to run a pig tail.. make sure the rail inner diameter will fit it. For example.. SAR rail will not run a pigtail... but the BAR rail will. 7.5" barrel with the 9" rail is the combo that covers the flaming pig half way. Flaming pig is worth the cost on a 7.5.. very easy to shoot.. no gas to the face and very non-concussive, but still loud. I run a SAR rail with a normal gas tub just fine with a pig. I am building a BAR rail with the pig tail because I am curious about it. As an engineer I completely disagree with those who say the pigtail is a marketing scheme. While it might not be needed and does cost more... still the pressure drop in a pipe is proportional to the diameter and length of the pipe (L/D). Set D=1 and go from there. (means longer the pipe gets.. greater the pressure drop is....) 
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