Got the spray foam done. Glad I added the fire breaks. Here are a couple shots
Here is a quick stop motion:
Before we get the cement poured, we need to stub in the electrical. We are ‘splicing into the barn power for this:
And then the cement was poured:
Started by getting the site nice and level with some dirt:
then added 6-8 inches of crushed concrete:
Ready for framing!
Another draft document. Have a look and leave comments so I can make it better. HERE is the link to the pdf
HERE is a draft copy of the Shooting Log Book I am trying to put together
Let me know what you think by leaving a comment
Started building the new range. Started by planting the back 6×6 treated posts.
A little while later, added 2 more on both sides.
Then we started stacking the ties.
A little over half way done.
Got some more done today:
Cut the excess off the top:
We used 10 inch screws to secure the ties to the posts:
I will be using the excess cut from the top to make braces for the back:
Got the angles on the 6×6’s
Planted the support 4×4’s four feet deep and concreted in:
Back Finished up:
I added 2 leftover ties to the corners:
Dropped in some dirt:
Got it pushed back:
Think we are ready to shoot! We will continually make improvements but I think the major work is done.
The jig is a router jig that makes machining your 80% lower easier, faster, and safer by utilizing a router instead of a drill press. The jig allows you to complete an 80% lower quickly, easily and pretty fool proof. This jig is easy enough for anyone to use. You also save money on tools. You do not need to own a drill press, mill, or any measuring tools to use the Jig. You might be able to borrow the tools from a friend or relative. The jig can be reused for dozens of lowers.
The lower receiver is legally the firearm, and as such it is the controlled part. Generally, the law requires licensed manufacturers and importers to mark the designated receiver with a serial number, the manufacturer or importer, the model and caliber.
“Unfinished receivers”, also called “80 percent receivers” or “blanks”, are partially completed receivers with no serial numbers. Purchasers must perform their own finishing work in order to make the receiver usable. The finishing of receivers for sale or distribution by unlicensed persons is against US law. Because an unfinished 80% receiver is not a firearm, purchasers do not need to pass a background check and it can be shipped directly to them.
Putting together your lower receiver is pretty easy if you follow these steps:
1. MAGAZINE CATCH ASSEMBLY
• Install magazine catch into recess on left of receiver.
• Install spring onto threaded portion of magazine catch from the right side of receiver.
• Screw button onto threaded portion of magazine catch 3 or 4 turns.
• Use a punch (larger than the hole in magazine button) or wooden dowel to push in the magazine button so you can turn the magazine catch clockwise until the end of the catch is flush with the magazine button head. You can hold the receiver and press the punch against the table to do this, but put something between the punch and the magazine catch button to prevent marking it. Do this step first, as it will prevent the bolt catch from getting in the way as you turn the magazine catch into place.
2. TRIGGER GUARD ASSEMBLY
• Attach front of trigger guard assembly to the receiver using the detent.
• Lay receiver on you bench block or a block of wood, and drive roll pin into receiver and rear of trigger guard using drive pin punch.
3. BOLT CATCH ASSEMBLY
• When installing the bolt catch, first drive the roll pin about halfway into the rear hump from the rear of the receiver using roll pin holder. It can be very difficult to get this pin started. If you don’t have a roll pin holder, then try holding it in place with a pair of needle nose pliers while you drive using a 5/32″ punch.
• Install spring in hole on left side of receiver.
• Install bolt catch plunger on top of spring with round portion on top and small end into receiver. Make sure it moves freely in its hole.
• Install bolt catch in receiver.
• Use a 3/32″ punch to hold the assembly by placing it through the front hump.
• The pin can be driven the rest of the way from the rear as the punch will be pushed out and while holding the bolt catch in correct alignment.
4. PIVOT PIN ASSEMBLY
• Insert spring and detent into receiver.
• Compress detent in recess using 3/32″ punch and rotate tool.
• Push out tool with pivot pin and rotate until detent is in groove of pivot pin.
5. TRIGGER ASSEMBLY
• Shoulder trigger spring onto trigger with ends of spring forward and under.
• Install disconnector spring with the wider portion of spring down towards trigger and push until it locks in there.
• Position disconnector on top of trigger, where trigger pin will hold both in place.
• Insert trigger assembly into receiver.
• Insert trigger retaining pin through receiver, trigger, and disconnector. The trigger pin has 2 grooves in it; one in the middle of the pin and one off to one side. It does not matter which way it is inserted, though common practice is to insert from left to right, with the groove to the left.
• Insert hammer pin from opposite side to help align things as you push the trigger pin in and the hammer pin out. You will have to push down on trigger assembly to align the holes and get the pin in all the way.
6. HAMMER ASSEMBLY
• Install spring onto hammer, ends of spring to rear and shoulder on back of hammer.
• Install hammer in receiver with feet pointing rearward away from hammer
• Use 5/32″ punch to retain hammer in place as you insert hammer retaining pin.
• Like the trigger pin, you may have to push down and align the holes perfectly in order to push the pin in all the way.
• Ends of the hammer spring will rest on top of the trigger pin, with one end in the groove on the trigger pin.
7. PISTOL GRIP ASSEMBLY
• Install detent, pointed end towards the selector, and the spring into the receiver from the bottom.
• Carefully compress the spring with the grip and make sure spring fits into hole in grip.
• Check the function of the selector with the grip held in place; if too tight (unable to rotate) you may need to either cut the spring, or clean out the hole in the grip.
• Once feel is acceptable, secure the grip in place with the screw and lock washer.
• Insert retainer spring and retainer into recess in lower.
• Install buffer tube, backplate, and locking ring onto receiver and depress retainer when necessary to get it to rest under the extension tube. Turn tube until it is about 1/4 turn past the correct location.
• Install takedown pin with groove to the rear and install detent and spring from the rear of the receiver.
• Backplate will now hold spring in place when you turn the extension tube back 1/4 turn.
• Tighten locking ring using telestock wrench for a snug fit.
• With the hammer down, insert buffer spring and buffer into buffer tube until retainer snaps up to lock it in place.
• Function check takedown pin, stock, and buffer retainer.
If you want an accurate rifle, don’t leave a lot of front/back bolt play (keep it .003″ but no more than .005″). Factory rifles run .012″ to .015″ play, which is OK if you need to leave room for dirt and grime in a military or field application. However, that amount of play is not ideal for a high-accuracy AR build. A lot of front/back bolt play allows rounds to be hammered into the chamber and actually re-formed in a non-consistent way, as they are loaded into the chamber.
The bolt affects accuracy in an AR-15 more than the carrier group. To get the most accuracy, the bolt and barrel have to be machined so that the headspacing is optimal when the round is chambered and the bolt locked. That is why if one orders a match-grade barrel for an AR-15 either the barrel comes with a bolt, the barrel manufacturer requires you to send in your bolt (prior to machining the barrel you’ve ordered), or the manufacturer requires you to send dimensions from your bolt.
The best accuracy usually comes from the bearing surface of the bullet nearly touching the rifling. Having the bullet jump any significant distance to the rifling tends to negatively affect accuracy. This is true in any rifle, not just the AR-15.
In addition to the above, you will want to keep the chamber, barrel extension, and carrier assembly clean to help insure consistent bolt lock ups critical to accuracy. You will also want to occasionally apply lube directly to bolt rings during shooting sessions.
Carrier key staking is also mentioned in the article. Young Manufacturing does not stake their carrier keys. “There has been a lot of talk about the pros and cons of staking the gas key on the carrier. Here is our opinion and why Young Manufacturing will not stake keys. We have been making carriers since 1991. The US Mil Spec. assembly drawing requires the carrier key to be staked. Contrary to some popular opinions staking does not SEAL the gas key. Staking keeps the screws from backing out Period. If you do not properly torque the screws to 56 inch pounds you will be staking a screw that is loose or one that is over torqued and prone to breakage.” Not sure how I fell about that, for me, a staked key is the only way to go. Something just does not feel right about it not being staked.