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TackleberryMCS last won the day on March 10

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  1. The barrel extension should not fit loosely in the upper receiver. It should fit somewhat snug. It the fit is loose and sloppy, then two things are possible. The barrel extension is out of spec, the receiver is out of spec, or both. My bet is on the barrel extension being out of spec, but you can find out by trying another barrel to check its fit with the upper receiver.
  2. Quite frankly, I believe it may very well be the barrel that is the problem. No scope and mount is going to make any difference if the barrel performs badly. Personally, when I see the companies that sell these barrels, it screams "DO NOT BUY". I like barrels from companies I know. I will pay more for for these barrels because I know they perform to my standards. I made a mistake one time buying an inexpensive and unproven barrel. NEVER AGAIN! I replaced it with a $370 barrel from Compass Lake Engineering that is exemplary. For what you may have paid for the barrel you have, you could have spent about $30 more and gotten a much better and proven barrel (Stealth or PredatAR) with excellent accuracy from LaRue Tactical. Your upper receiver should be fine. Aero Precision makes good stuff. Again, I believe the culprit is your barrel. The only other possible thing it could be is your barrel nut being just loose enough to throw the barrel off. The slightest movement of the barrel can really affect accuracy. I would make sure that everything is tight and torqued properly (per manufacturer's instructions). If everything is tight, I would look into replacing the barrel. Fancy looking barrels do not win brownie points if they are inaccurate. It is better to put good money into a barrel that will perform well rather than look good and not shoot well. LaRue Tactical Barrels Stealth - https://www.larue.com/products/5-56-stealth-barrel-k/ PredatAR - https://www.larue.com/products/5-56-predatar-barrel-k/ You may also want to look into Ballistic Advantage barrels. They are a bit cheaper and generally perform fairly well. https://www.ballisticadvantage.com/ar15-barrels
  3. When the patent Colt held on the AR-15 expired in 1977, it opened the door for anyone to produce an AR-15. That said, no manufacturer is held to any certain standard except in the case of manufacturing weapons for the DoD. That is where "MIL-STD", or "MIL-SPEC", comes in. MIL-SPEC encompasses many different facets that include things like metals, coatings, tolerances, etc. Civilian ARs are not subject to these standards and that is evident in some ARs made these days. You mentioned quality control and that is important, but it is only part of the of the process. A company's warranty is important, but not a deciding factor for many. That is not something that sways my decision making. I look for a reputable manufacturer has has been producing good products and have been proven over and over again to be dependable. Springfield Armory produces some fine weapons, but they are new to the AR game and have still to prove themselves as a real contender in today's market. The SAINT, as I said, is a good AR, but compared to the FN line of ARs, it does not have the reputation or craftsmanship FN has demonstrated over many years. FN is a MIL-SPEC manufacturer (especially M16A4s, M4s, and M4A1s) and that carries over to their commercial line of products. Their barrels are some the most robust and accurate ones you can buy. FN has a history of producing top quality barrels as they are made from the same steel they use for their machineguns. The same quality used in producing their military ARs is also used in their commercial line. I would pay extra for that all day long.
  4. I agree. For this and other reasons. The SAINT is a good AR, but the FN is a better choice as they know a thing or two about ARs and have been making them for many years, primarily for the military. Springfield is a relative newcomer in the AR world. Personally, I would put my hard-earned money on the FN, hands down.
  5. That is the kind of response I expected. You never disappoint.
  6. After acquiring my latest Colt (AR6520), I had to take an update photo of my Colt AR family.
  7. Last night, I picked up my latest acquisition. I made the purchase form a fellow AR15Armory member. It is an excellent condition Colt AR-15 A2 GOVT CARBINE (AR6520) with all the goodies. I was elated to be able to buy this. I could not pass up the opportunity. It now has a good home with the rest of my Colts, including its cousin, my Colt AR6320.
  8. I have a number of small parts, but I made it a practice several years ago to not buy larger pieces until I had a real reason for them (to do a specific build). I had found by having larger pieces laying around (ie, handguards, stocks, optics, BUISs, receivers, barrels, etc.) that I had a greater chance of building something without any reason behind it. Granted, I love building and get a great deal of pleasure from it, but these days I need a reason to justify it other than just doing it. I rarely buy a complete AR, although I did just drop some cash for an excellent condition Colt AR-15 A2 GOVT CARBINE (AR6520 - LE markings) to add to my Colt collection. This is one of the few exceptions I will make to justify buying a complete AR.
  9. Explain why you had to remove the optic to use the BUISs. If the BUISs were co-witnessed through the optic, you should not have to remove the optic even to replace batteries. In addition, if you are needing to have the removal of an optic in an expedient fashion, that is why they made quick release mounts. If you are using a mount that does not have a quick release, that is where it is really important to have BUISs properly co-witnessed with the optic so as not to have any issues with sighting if the optic goes down. As far as BUISs not being needed, that is a personal opinion and not a fact. Most people run BUISs for the very reason I explained. If you have to keep in the fight after an optic failure, you NEED BUISs. They are essential. Now, of it is just a plinker and you are not worried about using the weapon in a real world scenario, then you may not have the need for BUISs. That is up to the individual. In addition, removing BUISs for weight savings is not a valid reason. Most all BUISs only weigh only a few ounces each. Any weight from them is negligible. Personally, of all 49 ARs I own, there is not one without BUISs.
  10. It makes no difference whether you are running a fixed or flip-up BUIS. You determine whether you want absolute (the red-dot reticle sits on top of the FSP) or lower 1/3rd (top of the FSP is in the lower 1/3rd of the viewing lens below the red-dot reticle) co-witness and choose the according mount for whatever co-witness setup you want. In any event, the optic can be used regardless of the co-witness you choose. Co-witnessing is the ability to have the use of your BUISs through the lens of the optic so as not to have to remove the optic in the event it goes down.
  11. Can you post a picture of the entire upper? Back in the days of the ban, DPMS and Bushmaster were pinning and welding brakes on their barrels as FH were considered an "evil" feature and were banned as part of the "Assault Weapons Ban" (1994-2004). The brake can be removed, but requires some careful cutting so as to not damage the threads on the barrel. As far as a low profile gas block goes, there are quite a few to choose from in varying price ranges. You can reuse the gas tube, but if you can buy a new one if you so choose. Another point to make is that, depending on which free-float handguard you are choosing, the handguard may or may not use the existing barrel nut. Many free-float handguards, primarily 1-pc. types, are coming with proprietary barrel nuts. In this case, you will also have to remove the existing barrel nut which requires the removal of the FSB which requires removal of the muzzle brake.
  12. The BUIS does not determine the co-witness, the optic mount does. You can choose a mount that will give you the co-witness of your choice. If I recall correctly, the Wilcox Ind. M68 mount on my Mk18 gives me a lower 1/3rd co-witness.
  13. Is this what you are looking for? This is the LMT TACTICAL REAR SIGHT L8A. Most anywhere you look, it is OOS. These were, and are, very popular rear sights. I have one on my Mk18 Mod 0 clone.
  14. MAGPUL MBUS PRO https://magpul.com/mbus-pro-sight-rear.html# Midwest Industries Combat https://www.midwestindustriesinc.com/Combat-Rifle-Flip-up-Rear-Sight-p/mi-crs-r.htm Troy Battlesight https://www.primaryarms.com/troy-industries-rear-folding-battle-sight-black LMT https://www.primaryarms.com/lewis-machine-and-tool-rear-back-up-sight
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