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012-在定制AR15的时候有什么选择 – what to consider when customizing AR15

we talked about where to buy guns and parts 2 weeks ago and that AR15 are like legos most parts can be replaced or upgraded today I want to talk about what are the choices for parts when we customize AR15s the first thing is to figure out what the rifle is for for example, is it for close quarter combat or is it for a sniper rifle for long distances or is it a multi purpose gun I’ll talk about all the parts and their impact on the gun fist thing is to consider the caliber the most popular is 5.56 NATO, all my guns are 5.56 there are other choices with AR15 223 wylde for example 7.62×39, 300 blk every caliber has a different purpose and effect on the gun I’m not going to describe every caliber you can can easily find more info online the second thing is the barrel the most obvious is the length of the barrel this gun has a 16inch barrel this gun has a 18 inch barrel there are both longer and shorter barrels out there the shortest barrel is 7″ pistol length and goes longer, 7″, 10″, 11″ 12″ 14″, 16″ – which is the min allowed length for rifle barrel allowed federally (in USA) so typically barrels are 16″ and above going up to 20″ and even 24″ the barrel length influences the muzzle speed of the bullet the longer the barrel, the fast the bullet with higher energy and range the second thing is barrel profiles these two barrel’s profile are the same it’s so called SPR this is Government profile you can see that SPR is much thicker than government especially closer to the chamber the benefit of thicker profile is that there are much more steel, so it won’t heat up that quickly but it’s much heavier these two barrel has the same profile and the same length, both SPR this barrel is about 40 oz about 1.2 this barrel is so called fluted where some materials were removed so with the same profile, it can save about 200grams probably the most common barrel is government profile there’s also pencil profile, which is even thinner the government profile is thicker towards the muzzle it’s a long story why it’s like this but pencil profile is even thinner which make it much lighter, but the drawback is after a few dozen shots it gets hot and losses stiffness which reduces accuracy the other difference is in the barrel material in the type of steel used these 3 barrels are 4150 CMV steel (Chromoly Vanadium) this barrel is my new purchase, its stainless steel stainless steel is a bit more expensive and supposedly more accurate but does make a difference for me, since I’m not a good shot but stainless is softer than CMV so the wear on the barrel is greater but I don’t shoot that much, so stainless steel is more for fun also it looks very nice also, the barrel has a gas system and can vary in length which is the distance between the gas block and the chamber this is mid-length, 9″ gas system length is related to the barrel length 18″ and longer barrel typically use rifle length gas system with 16″ barrel, you can choose between carbine length (this long) and mid length the reason I buy mid-length because its longer, so the gas pressure is lower and takes slightly longer to expand and has a smaller impulse when pushing back the BCG making it softer shooting also reduces wear on the BCG, due to lower gas pressure the barrel has big impacts on the best use of the gun for close quarter, the barrel should short for example 14.5″ barrel with a pinned muzzle device the most common is 16″ which is pretty versatile for higher accuracy and longer range 18 or 20″ barrels are good for 4-500m stainless steel is a good material and a .223 wylde chambering that has tighter tolerances with match ammunition for better accuracy I bought this barrel for 3-400m shots but there are no ranges here for that distance the next item is the handguard on military M4s, they use this kind of handguard not the free floating ones this one is fasten to the front sight block (FSB) this type of hand guard, because they’re touch the barrel it reduces the accuracy less accurate than free floating handguards but it’s lighter and very rugged and of course, much cheaper about 30-40 for a Magpul free floating hand guards are at least $100 weight are similar so it’s a personal choice there are many choices for free floating hand guard such as the connection points. all of mine are m-lok which is the most popular there are choices in width and weight the next part is the stock all of my guns have the same stock over a carbine length buffer tube which can be extended in theory but since I live in California it has to be fixed I bought the cheapest there are many choices for close quarter, this stock is good enough but for precision shooting, rifle length buffer are used with adjustable length of pull and cheek riser but those types are at least $100 mine are $30-40 of course the optic is important but I’ve talked about them in other videos a very important part is the trigger these 3 guns have the same mil-spec trigger made by Spikes Tactical, because I think their trigger are well polished and have a good feel because this gun is going to be for precision I’ll upgrade to a drop in trigger similar to my AR10 which has a 3.5lb pull which has a much better feeling to it with a shorter trigger pull and reset the most common trigger (mil spec) is about 30-40 but a good trigger like Gisselle is 250 the one I bought is much cheaper around 100 trigger has big impact on accuracy because the lighter trigger will need less force to pull it which will translate to a smaller movement on the gun but the lighter the pull, the easier for a misfire so for close quarter, there’s no real need for a light trigger since you don’t need to be very accurate and it’s better to be safer and avoid misfire so mil spec trigger is a good choice but if you want a better milspec trigger I recommend ALG-Defense which I have in one of the guns, but not sure which 🙂 its milspec with a 6lb trigger pull today we talked about the barrel length profile, material we also talked about the hand guard stock and trigger

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