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Author Topic: Building an AR-15 in 450 Bushmaster  (Read 7487 times)

Offline MI_Bowhunter

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Re: Building an AR-15 in 450 Bushmaster
« Reply #45 on: March 27, 2017, 10:52:12 AM »
It's been a while since I updated this but rest assured I haven't abandoned this project!!

I really do not like to paint parts when it is cold.   I also do not have a sand blasting box so I have to do the prep work outside as well.  I like to hit the parts with a light blasting to give the paint something to really stick to.  Just an extra step that I feel results in a better end product.

Once we start getting a few nice day's I'll be right back on it.
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Offline MI_Bowhunter

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Re: Building an AR-15 in 450 Bushmaster
« Reply #46 on: September 26, 2017, 09:40:19 PM »
Update, I had some issue the prevented me from Cerekoting the parts so I bought another lower that was already painted and milled it again.   ;D

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Offline MI_Bowhunter

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Re: Building an AR-15 in 450 Bushmaster
« Reply #47 on: September 26, 2017, 09:41:16 PM »
More pics...
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Offline MI_Bowhunter

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Re: Building an AR-15 in 450 Bushmaster
« Reply #48 on: September 26, 2017, 09:42:31 PM »
And some more...


Hope to get the rest of the gun assembled this week, the season is closing in fast.


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Offline MI_Bowhunter

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Re: Building an AR-15 in 450 Bushmaster
« Reply #49 on: September 27, 2017, 08:38:07 AM »
Woo Hooo, A friend has offered to Cerekote the remaining upper parts for me with some coating that he had left over from one of his projects if I cover shipping.


Looks like this may actually come together the way I intended after all.
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Offline Madgomer

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Re: Building an AR-15 in 450 Bushmaster
« Reply #50 on: September 27, 2017, 08:54:57 PM »
Thanks for the update on your project - for some reason I got to thinking about this when I was down in the gun room last weekend.  Based on the lessons you learned on the first lower, did the machining of the second one go better for you?  Also curious how your jigs held up through the two lowers - could you use that on quite a few more or is it already starting to show some wear?
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Offline MI_Bowhunter

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Re: Building an AR-15 in 450 Bushmaster
« Reply #51 on: September 28, 2017, 05:44:48 PM »
Mad, I learn a little more with each one.  This time I used my guages to measure the distence from the top of the table to the top  of the lower.his gave me a point of reference when measuring the depth of the trigger pocket.  This one I nailed at 1.251"  The jig comes with a measure to adjust depth but I prefer to use the guage as well to be more accurate.

I also made sure the bit was tight int the router after every other pass when I stopped to vacuum out the pocket.   I milled a plastic upper where the bit came loose and ripped through the bottom, screwing up the trigger hole.

I have completed three with this jig so far, two alum and one polymer.  The polymer was more of a test run but it worked good except for the above mentioned issue with a loose end mill bit.

When drilling the pilot holes I did not use enough cutting oil the first time and dulled several drill bits.  This time I used copious amounts and each one cut like butter using the same bit.

I am noticing some wear around the top of the templates where the end mill bit rides when cutting the edges.  This is resulting in a slight wave pattern if you run your finger across it.    I may be putting too much pressure on it with the bit when cutting the edges.  I will check when I assemble the lower whether that resulted in too much play around the trigger and hammer.

Overall I am impressed with the quality and ease of use of this jig.    I see they have an updated model out now that allows you to mill a 5.56 or a .308 lower using the same jig in different configurations.  ;D

I do want to eventually build a .308 from a 80% lower.
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Offline Madgomer

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Re: Building an AR-15 in 450 Bushmaster
« Reply #52 on: September 28, 2017, 08:15:45 PM »
Sounds good - thanks for the feedback.  I've toyed with the idea of building one up from an 80% lower - not sure if I'll get myself talked into that or not.  Haven't messed around with the polymer lowers yet either - almost bought one a couple of years ago (a finished lower) when parts were hard to come by, but found a guy locally who had a stripped S&W on the shelf so went that way instead.  Really curious how the polymer units handle the extremes of hot & cold temps.
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and enjoy it!

Offline MI_Bowhunter

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Re: Building an AR-15 in 450 Bushmaster
« Reply #53 on: October 13, 2017, 06:26:45 AM »
Making a little more progress when I can make the time.

Finished assembling the upper (sans scope).   The dust door should be arriving today or tomorrow, I decided to go with something different than I had originally planned.

My friend did a great job on the paint.   He painted the scope and rings so they match as well.
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Offline Madgomer

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Re: Building an AR-15 in 450 Bushmaster
« Reply #54 on: October 13, 2017, 04:26:35 PM »
Looking good!   Good luck with the dust cover - that itty bitty little C clip on the end of the pivot shaft has a tendency to make me crazy.  On my last build I either had a fat C clip or the slot in the rod was too tight - I think I exercised my full four letter word vocabulary before I finally got it to stay put.  It can be really tough to find that little clip when it drops to the floor - did it twice!
 --099-780
One of God's greatest gifts to us is
the great outdoors - get out there
and enjoy it!

Offline MI_Bowhunter

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Re: Building an AR-15 in 450 Bushmaster
« Reply #55 on: October 13, 2017, 07:32:40 PM »
Trying something different this time, found a quick release dust cover.

More progress tonight. Got the scope mounts installed, lapped, scope mounted, aligned and everything torqed and lock-tite'd.

Also finished as much of the lower as I could. Still waiting on the fde grip.

Once the rest of the parts arrive (eta tomorrow)​​ all I need to do is add a bit of the camo to break up the outline and shoot it.
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Offline Madgomer

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Re: Building an AR-15 in 450 Bushmaster
« Reply #56 on: October 14, 2017, 10:52:26 AM »
Looking good MI-B - when I saw your pictures a couple of days ago I thought it was olive drab, but in the one with your lapping tool it's much more clear as FDE.  I like it, anxious to hear your thoughts after you get a chance to shoot it.
One of God's greatest gifts to us is
the great outdoors - get out there
and enjoy it!

Offline MichiganLouie

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Re: Building an AR-15 in 450 Bushmaster
« Reply #57 on: October 14, 2017, 02:08:42 PM »
That is looking real nice, Mike. 
Don't ask the Lord to guide your steps, unless you're willing to move your feet.
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Offline MI_Bowhunter

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Re: Building an AR-15 in 450 Bushmaster
« Reply #58 on: October 14, 2017, 05:50:23 PM »
Done! May add some camo but pretty much done.

Funny how no two pieces of FDE are exactly the same. LOL


The flourescent lights in my basement make it look green.
« Last Edit: October 14, 2017, 05:52:20 PM by MI_Bowhunter »
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Offline MI_Bowhunter

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Re: Building an AR-15 in 450 Bushmaster
« Reply #59 on: October 14, 2017, 05:51:07 PM »
More
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