Hey just want to share some of my experiences on building delts and arms. (My best bodyparts)

My routine for delts is fairly simple and very effective in my opinion:

Smith machine shoulder press at about 70 degree angle or you can go maybe to 65 at the lowest.
2 sets warmup with light weight
1 set fairly heavy weight but not to failure
1 set maximum weight 8-10 reps

standing dumbbell lateral raises
I tend to use not the most perfect form but pretty close so I can handle heavier weights for this exercise.

2 sets warmup to get a pump
1 set with a fairly heavy weight
1 set 10 reps with maximum amount of weight
1 set 8 reps with maximum amount of weight and drop to a weight where you can crank out another 4 reps.

Reverse pec dec flys
I just do 5 sets increasing weight to where I can only do no more then 10

Reverse cable flies
Standing facing the cable fly machine I will do a crossover to work the delts.

Sometimes I would alternate the front press on the smith with a behind the neck press although I feel this would not allow someone to use the maximum amount of weight due to the balance factor and riskiness of this exercise.

Arms:
My arm routine is VERY simple but I would say highly effective.

Tris:
3 sets warmup with close grip bench press on a smith to where you get a pump
1 set with maximum amount of weight for 10 reps

2 sets warmup on the straight bar cable press down
1 set with maximum weight for 10 reps

2 sets warmup with overhead dumbbell extension
1 set with max weight to failure for 10 reps

I see alot of people recommend weighted dips but I think that would put too much strain and grinding on your elbows and shoulder region.

Bis:

My bicep routine is mostly made up of usage of machines for I believe they are the best in developing biceps through isolation.

2 sets warmup on dumbbell preacher curl
1 set with max weight 8 reps

2 sets warmup on Y grip curl machine that mimics a preacher curl
1 set to failure with 6 reps

2 sets warmup on nautilus machine with the arm rest at a flat angle
1 set with moderate weight to build a pump
1 set 10 reps with max weight to failure.

And there is my routine for delts and arms! This is how I built my 20.5 inch guns and I would say rather beefy delts.

I hope this routine would help those looking to try a new routine.